I think if someone on V8 now had the car, we'd have heard about it. Have you tried contacting that "seller" to see if it did indeed change hands? From the comments in this thread about the seller's actions, it sounds more like a scam to me.
Look at cars.com Search for 1968 Buicks in the milwaukee area. There's a 68 4-speed convertible in there for 20k. Just drop a 3 speed in it... long link: http://www.cars.com/go/search/detai...onal&paId=243638514&recnum=36&leadExists=true
Don't know if you've already seen it or if its the same one as before but your car is on E-bay. Item number: 110234248623