Received Tixwaves cards despite payment recall?

Hello,

I ordered two tickets on Tixwaves and only later discovered that this site was shady and dubious. So I called my bank to reverse the transfer and received my money back a few hours later.

However, I have now received cards, but in my opinion they look fake.

What should I do now? Should I simply return the cards? Can I be prosecuted for receiving them without payment?