In the last four years, I have spent (wasted?) a good deal of time and money in an effort to find larger lots of unchecked stamps, both on
ebay and from stamp auction houses. I thought it was time to share the conclusions I've formed on the subject.
The bulk lots sold by stamp auction houses - and I think that by now I've bought bulk lots from all of the major ones in Australia plus a couple overseas - have been thoroughly checked. Auction houses are used as dumping grounds by professional dealers for lots they know contain nothing worthwhile whatsoever. While the lots are cunningly described in a manner so as to excite the idea that they may yield some good stuff (e.g., "Very good postmark potential"), they invariably consist of out and out junk.
NB: In the real world, the phrase 'postmark potential' - which is widely used in descriptions of bulk lots - means 'Not ALL the stamps have machine cancels.'
Exception that proves the rule: the best postmark I ever found was in a large lot of KGV reds I bought from Hallmark Auctions in Adelaide. The lot had been thoroughly checked for shades, varieties and postmarks, but one good cancel slipped through the cracks because it was only partial and not even that legible. It turned out to be very rare and did quite well when I auctioned it on
ebay.
It is true that bulk lots sold on
ebay often suffer from the same problem, but my experience is that there is a much better chance of finding unsearched lots on
ebay than anywhere else because you're more likely to be getting stamps from private individuals than professional dealers, who don't leave a stone unturned. Apart from the postmark referred to above, every better stamp, postmark, or variety, including inverted watermark, that I've ever found I got off
ebay. (The same goes for coins, although my experience in this respect is not as extensive.)
I used to be highly critical of
ebay, but the truth is that I've tried my hardest to find an alternative source of bulk stamps and I haven't succeeded.
I'm going to conclude with the observation that on
ebay you can at least leave feedback, so that if a lot has been misrepresented you can say so. You can usually even get your money back. Not too long ago I bought a vintage album from an
ebay seller who made out that the album contained an outstanding collection of classic European stamps. But the scans of a few pages that had been included in the listing left a more ambiguous impression. Since the seller stated that returns were accepted, I decided to take the seller at his word and buy the album. I soon discovered that while there were many good stamps in the album, they were all damaged. Every single one of them (and many badly damaged at that). However, in that case, I was able to return the album and get my money back. But you can't do that with stuff purchased at auction, even though auction houses usually provide even fewer images for you to base your purchasing decisions upon that you get on
ebay. And you can't leave negative feedback to warn others if you've had a bad experience!