Hi Bob,
Just thought I would throw my opinion in for the record - I got Debo out of the paper with no papers either - he's still the greatest Boxer I know!
But, on the other hand... I wish I would have went through a breeder, we had some problems in the beginning. I got Debo at six weeks and the lady said he already had his first shot, then I gave him his second then he got Parvo - and I know it's not this lady's fault, but my own - but be really really careful, those shots are very very important! I would call a vet or get more opinions from the board 11 weeks seems older to have no shots...I learned with Parvo, it takes seven days for the symptoms to show, so a puppy could have something potential and it may not show for seven days. Be careful and ask lots of questions.
Other than that, have fun with your new puppy!!!