Rogues "Opportunity" PS

The sudden appearance of stone mint copies of a rare 45 on eBay scares me. Especially with an even rarer sleeve. It would be nice to be assured by the seller that this is the only copy he knows about.

(Written by someone who has been through it before).
 
I've tried forever to track these fellas. I don't even know the city, town or village.
 
A copy of this 45, with its picture sleeve, turned up on Discogs during the weekend from a seller called "VG_ALLIN", graded NM/NM and priced at $4500. It was up for less than 24 hours, it's not there anymore, so it either sold or the seller took it down again.
 
Saw the listing too. Quantity find plot thickening. Wrote to the seller and he replied he had been "sitting on this copy" and only the recent ebay sale prompted him to list. Not convinced.