Unbelievable ***UPDATE***

The kid actually brought back my cards. He says he genuinely didn't know the card was fake. I have my doubts but he did the right thing so I'll give the benefit. I let him keep the Wartortle Alt 151 and a japanese promo for doing the right thing. Showed him why it was fake he had other slabs with him he wanted me to check and they were real. I was extremely lucky and thanks to everyone's comments on the previous post have learned a lot when trading slabs.