Orion Millennium's "Crime Masterworks Books"

The publisher’s website only lists 24 of them because the other 30+ have either gone out of print or have been re-released in a different format. This ultimately makes nonsense out of collecting all of them. Another issue with the series is that they stopped numbering them after 40. Why? I do not know but I have my suspicions. I think that it was to give the series a more nebulous feel so that any book could fit any where and also allow the release of a spate of Hammett’s and Thompson’s at the same time.
My gut feeling about the series is that it will end shortly, (pity) as there seems to be no books listed for release in 2007.
The other issue is regarding the listings in Amazon. Unfortunately Amazon has taken to listing books that were never in, or going to be in the series. They did this with the SF Masterworks, (Camp Concentration & 334) and I think this is the situation with The Steam Pig

Feel free to comment. It would be good to find definitive answers to all these issues