Always check seller's reputation:
- Check backpack tf trust ratings
- Check if people who left them +reps actually have the items in their inventory
- They can't share more than 5 times per 12 months with one account, so if they got more than 5 reviews in a short span of time then be cautious

I've got reports that recently a user by the name of Neo has been scamming people on the forums and in our group, using him as an example we can see that:
- They have -1 trust rating[backpack.tf] on backpack tf
- +reps on their profile were faked since none of the people who left them actually received any Poker Night items
- They got too many reviews in a really short span of time