Here's a personal "dumpster story"...
When I purchased the Fine Recording Studio remains about 10 years ago, I was only interested in garage records and tapes, which received my most scrupulous attention. I had absolutely no idea whatsoever that soul 45s had any value, or that there was such a thing as "northern soul" collectors.
There were a few soul 45s released on Fine, the Soul Brothers Six and The Darling Dears in particular. Also a record by a Fine subsidiary label Coy, by The Vel-Tones. I found a few boxes of each, in mint condition*. I kept about 5 copies of every non-garage 45 I found, and tossed all the extras into a huge dumpster that we always have for rubbish at our factory. I filled up the 20 ft dumpster with all the slimy stinking trash from the Fine studio remains, which was mostly destroyed by water damage. Or not garage, and therefore no good.
That weekend I happened to be browsing a bookstore, when I picked up a book of Goldmine record values. At the front of the book was a list of the "Goldmine 100 rarest records of all time". In the list was The Vel-Tones on Coy, which I remembered I had thrown into the dumpster.
So, I went straight back to the dumpster, in the middle of a rainstorm, and plunged headfirst into the huge trash bin, frantically digging in the piles of lice infested slimy junk. I had to completely empty the dumpster to get to the boxes of 45s which were at the very bottom, of course. It took all day to rescue every last 45. Nothing at all escaped!
All of the copies of The Darling Dears (on Flower City) and Soul Brothers Six (on Fine) 45s that have appeared on eBay over the last 10 years, came out of that dumpster!
http://www.popsike.com/php/quicksearch.php?searchtext=darling dears&pagenum=1&incldescr=&sortord=adate&thumbs=&currsel=2
*correction - I only found a couple of mint Vel-Tones, the rest were water damaged. Soul Brothers Six and Darling Dears were all mint.