Has anyone else seen a similar situation of stolen art on random packaging?
Countless times. We have a lot of....ehm... i think they call them "One dollar stores" in America. We have quite a lot of those and they often have stuff from China. The products for children almost every time have some sort of anime images on the packaging. And it's always some kind of ripped art. ^^;
Yep, that's what we call them here, Family Dollar, Dollar Tree, Dollar General, etc. ^_^
I remember buying a pair of socks for cheap once, and Shiori from TokiMemo was on the tag randomly O_o