I don't see anything about the dodecahedrons being signed or stamped or branded in any way, so I can't buy them being a resume. Seems like if it were your personal proof of employability, and you cared a lot about it not being stolen, the first thing you'd put some mark on it to indicate it was yours. And then there's the fact that some of them have been found buried in coin hoards, which doesn't make sense (why would you collect a craftsman's portfolio piece and store it with your treasure?).