.... BSA 500cc Gold Star still in the crate and it sold for $10,000.....
Bill, the storys circulating about those CBXs are that the owner may....may sell one. The last price I had heard was for $15,000. But the price figure was about 10 years ago. I haven't heard the story lately with a price attached since. Again though, no address, no phone - just storys. But either the Urban Legend Grapevine is very well oiled and consistent in the tales, or there is a grain of truth in there somewhere.
A fellow told me 25 years ago about a 1969 Hemi Super Bee that was mothballed in a small town about an hour from me. Sat in a garage with an inch of dust on it - the typical old story. For years on lot of weekends over the years I would drive down and search that place trying to locate that car. About 10 or 12 years ago it was hauled out of its 25 plus year hibernation. Someone had indeed found it. And it was real. Wish there was some sort of truth analyzer for these old storys. Save a fellow a lot of time. 
Yeah, there really is no telling just how many situations like THAT that really exist. I've heard a few of those stories over the years myself, no telling how many situations like that, really exist. A little different deal, but I used to know where there was a 40' Ford coupe that was partially customized (body chopped and channeled, in a tasteful way) and a 392 Hemi with a 4sp. That's all I remember about the car. The interior had a pair of bucket seats. That was at least 48years ago. The car was just sitting off in a corner of one of my Dad's friend who rode motorcycles with him and my Granddad. Never saw the car out of that garage and no idea whatever happened to it. Love to have that car, but who knows where it is or what shape it is in.
The CBX thing is One story, but to think of the Hemi Super Bee that there just weren't very many around, is just too eerie to me. To think of one of those in a situation like that, is just Too much.
