There are plenty of legit items on ebay. Though I usually look for a photograph of the original box (instead of just a copy of the box art taken from the internet). People selling pirated copies aren't going to be able to provide the Pegaso or Young's box for each miniature. Might not be perfect, but it's the litmus test I use to determine if I buy something off ebay.
For example, I just bought this one and I think we can be pretty sure it's right.