I got caught out with one of these Toshiba sticks. I lodged a counterfeit dispute and was refunded without having to return the item.

If you read the wording on the packaging carefully regarding the available size, it is clearly a fake. Toshiba would never put 64gb capacity in large letters on the front, and then tell you on the back that the usable capacity is only 4gb. I mentioned this fact in the dispute. Not sure if it helped.

The guy who I bought mine off sold heaps, and plenty of people left positive feedback without realising they were fake. There's still quite a few being sold now.