M***a and t***m have many auctions so they should be legitimate buyers.
h***h, the winner, has only 3 auctions and might be an "illegitimate" buyer.

Without inspecting the collection in person it is, I think, quite difficult to assess the value. As said, most items as said to be good aesthetically and in good working condition which, if true, might place the average value above $30 per item.