One thing to remember about general auctions is that what things actually go for is highly dependent on who is there and bidding on stuff. Former classmate apparently picked up a pile of 'old' camera gear for $25 in an estate sale. Everyone else there was gunning for the antique furniture, and no one else had half a clue about cameras, so it had all been tossed into two lot boxes. One labeled 'miscellaneous film camera equipment', and he was the only one who bid on it, and the other was "Professional digital camera gear", and a few grandmothers fought over the canon rebels with kit lenses up to $500 or something, probably thinking it was a great gift for a grandkid.
That's why having a case is important to the story---the protagonist is the only one who looks at what's inside and hazards to make the bid.
So he got $30k or so in glass and high end medium format and compact range finder cameras.
The glorious thing about this from a writer's stand point is that you can stuff nearly anything in a lot box that no one else happens to be interested in, and it becomes perfectly reasonable from the reader's stand point.
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