I'd base an estimate off the ratio of known scrapped cars to known existing in this community. Are 20% of them destroyed/wasted? Then I'd apply this ratio to the original whole - 3008. Assuming 20% are scrapped (by enthusiasts, although not everyone here is an enthusiast), figure roughly 600 have been scrapped and the most optimistic number remaining would be 2400 or so.
Of course, another option might be for people to chip in some cash to buy 30 days of unlimited Carfax reports, then volunteer their time to run blocks of GVR4 VINs. I *think* Iceman has *all* the VINs, which would make it possible to Carfax all of them to know *for sure* how many are technically still viable. Couldn't figure out badge numbers with this method, but I think it might be the most accurate.
Thinking about it, 3000 VINs would break down to 100 VINs a day (in a 30 day period). Get 10 people a day to run 10 Carfax reports and it would be a done deal. Just a thought.