LOL, he's really dedicated with that. But he hasn't tried this one that I've done on numerous occasions: sign for something using a LADIES only card. Not sure if these things exists in the States but here we have some cards that are exclusive for women and clearly designed/marked so with special discounts/offers only valid for women.

So far nobody has batted an eye when I take one out, obtained with permission from my lady of course who tries not to grin too hard, and sign for whatever using similarly fraudulent names.