The link you listed is for the Information I gave the Bristol Owners web site a few years back. Afraid we have no real documentation on how many B28's were laid up from Bristol Yachts. But it starting to look like there may be 10 or 11. I have found 6 hulls but Because some of the boats were laid up and sold before November 1972 not all of the have a HIN in the hull.
So in you travels in Tx keep and eye for a B28.
One Hull was a Katina damage Boat that was sold on ebay this summer and shipped back to Marblehead Ma. So no telling were the rest are.
1972 Bristol 28