chalky, i somehow have the feeling a considerable percentage of these "big boys" don't actually take the time to find the records. they either take the time to dig out the cheque book and pay for some of these "big" tunes when they come for auction or wait until they get unknown tunes offered from the knowledgable collectors.
but generally i find this whole discussion quite amusing, isn't uncovering records part of the game "one-upmanship" as much as covering up unknown records?
unless one is the very first person to find/discover and play out a previously unknown disc nobody's entitled to object to uncover a record. simply either buying a cover up because you'd been offered it covered or buying a cover up because you've been told the true identity doesn't give you the right to forbid other collectors to uncover it...
and, even if you are said "very first person" and your "big" tune is uncovered, don't act like throwing your dolly out of the pram. get over it and find the next tune to cover...