With a quick google search, I found that breeder's site, and let me just say, WHAT IS SHE DOING?! I love white boxers (obviously :p), but she's breeding them? No reputable breeder would do that as far as I'm concerned. Also bragging that her "pack" killed one of her own males over breeding rights to a female? So glad I don't know this lady.
Exact quote from the site:
"They also carry what is known as a Piebald gene. This comes from having White in the gene pool as well as the Reverse Seal and Fawn. This causes the boxer to have 3 colors in the gene pool instead of just fawn and brindle. I did not set out to do this, and am tired of people who don't know anything about Irish Spotting, and Piebald genes giving me a hard time over these boxers!!They are here to stay like it or not."
Never, in purebred boxers, have I heard of piebald or irish spotting.