Posted By:
Alan USome of these are pretty basic and go along with the suggestions already mentioned:
-look at both what the seller has bought and sold in the past and see if it fits in with what they are selling.
-sending them a question of any sort can sometimes weed something out, Leon's suggestion of asking for additional scans is really a good one
-if it looks too good to be true, it probably is
-Alan
edited for spelling