Sadly, I'm currently in London. I try to get out as often as possible though LOL
Generally speaking, with a raw diet you feed a selection of RMBs (raw meaty bones) - so that's how bone gets included in the diet, it is quite simply eaten by the dog. Of course, we're talking about relatively small or soft bones here - not great big beef cannon bones. Most raw feeders will choose to base the diet on something like ckicken necks/wings/frames (the latter being the frame of the chicken after most of the meat is removed) since chicken is easily accessible, fairly priced and those particular parts provide an excellent meat/calcium/phosphorous ratio. Other good options include the soft cuts of beef such as brisket (sternum) or lamb/pig flaps since there's not too much meat and the bones are consumable.
I note that the retailer you're looking at is selling pretty close to the same thing - chopped up chicken wings and necks
Actually though, you don't even need them chopped up. A boxer is easily capable of coping with whole chicken necks or wings and getting some great teeth cleaning work in the process 
Anyway - I'd pass on the minced meat and either source your own chicken parts or else buy their chopped necks and wings.
So that sort of thing generally forms the basis of the diet. From there one would feed some variety in terms of meat protein sources - some beef, rabbit, venison, lamb, turkey... whatever you can get your hands on really. And a reasonable proportion of the diet (around 15%) needs to be offal. I do see that your retailer sells that too, in the form of tripe (you want the 'green' (ie. unbleached) stuff), chicken livers and heart. Again though, this is stuff you can source from your own butcher, along with liver, kidneys and the same organs of other animals than chickens too
Lastly, there is fruit and vegetable matter. Opinions do vary on how much of this a dog needs - ranging from zero to about 10% of the diet. The best way to feed those is raw and finely processed (since dogs don't digest vegetable matter that easily). You'd probably find it is easiest to persuade a dog to eat veges if it is mixed with offal.
So that's the basis of raw feeding. One would also feed the occassional fish meal, and add in things like eggs, flaxseed or olive oil, yoghurt and cottage cheese. Some people supplement further.
Anyway - although I haven't looked at all at the prices, it would seem that a lot of what your retailer is selling is fine. I would strongly suggest that you do a bit of research on raw feeding though, so that you can ensure that your dog is getting a balanced diet. I'd also choose primarily the chopped meat parts that do contain bone rather than the minced meat (though they say some of their mince includes bone, I can't see anywhere that tells you which ones LOL). I think you'd also find over time that you could probably provide your dog with the same food at a much better price directly from your butcher, but starting out with pre-made stuff certainly wouldn't hurt.
I do have to reiterate one last time that research is key. Raw diets aren't complicated or difficult to feed, but you do need to understand what constitutes a balanced diet and, over time, ensure that your dog is getting that variety. Feel free to check out the Barf forum here, and to ask any further questions there. There are quite a few raw feeders on this forum and plenty of good advice to be had
Generally speaking, with a raw diet you feed a selection of RMBs (raw meaty bones) - so that's how bone gets included in the diet, it is quite simply eaten by the dog. Of course, we're talking about relatively small or soft bones here - not great big beef cannon bones. Most raw feeders will choose to base the diet on something like ckicken necks/wings/frames (the latter being the frame of the chicken after most of the meat is removed) since chicken is easily accessible, fairly priced and those particular parts provide an excellent meat/calcium/phosphorous ratio. Other good options include the soft cuts of beef such as brisket (sternum) or lamb/pig flaps since there's not too much meat and the bones are consumable.
I note that the retailer you're looking at is selling pretty close to the same thing - chopped up chicken wings and necks
Actually though, you don't even need them chopped up. A boxer is easily capable of coping with whole chicken necks or wings and getting some great teeth cleaning work in the process Anyway - I'd pass on the minced meat and either source your own chicken parts or else buy their chopped necks and wings.So that sort of thing generally forms the basis of the diet. From there one would feed some variety in terms of meat protein sources - some beef, rabbit, venison, lamb, turkey... whatever you can get your hands on really. And a reasonable proportion of the diet (around 15%) needs to be offal. I do see that your retailer sells that too, in the form of tripe (you want the 'green' (ie. unbleached) stuff), chicken livers and heart. Again though, this is stuff you can source from your own butcher, along with liver, kidneys and the same organs of other animals than chickens too
Lastly, there is fruit and vegetable matter. Opinions do vary on how much of this a dog needs - ranging from zero to about 10% of the diet. The best way to feed those is raw and finely processed (since dogs don't digest vegetable matter that easily). You'd probably find it is easiest to persuade a dog to eat veges if it is mixed with offal.
So that's the basis of raw feeding. One would also feed the occassional fish meal, and add in things like eggs, flaxseed or olive oil, yoghurt and cottage cheese. Some people supplement further.
Anyway - although I haven't looked at all at the prices, it would seem that a lot of what your retailer is selling is fine. I would strongly suggest that you do a bit of research on raw feeding though, so that you can ensure that your dog is getting a balanced diet. I'd also choose primarily the chopped meat parts that do contain bone rather than the minced meat (though they say some of their mince includes bone, I can't see anywhere that tells you which ones LOL). I think you'd also find over time that you could probably provide your dog with the same food at a much better price directly from your butcher, but starting out with pre-made stuff certainly wouldn't hurt.
I do have to reiterate one last time that research is key. Raw diets aren't complicated or difficult to feed, but you do need to understand what constitutes a balanced diet and, over time, ensure that your dog is getting that variety. Feel free to check out the Barf forum here, and to ask any further questions there. There are quite a few raw feeders on this forum and plenty of good advice to be had
