there was a car trader down our way single bloke who died, he had over 40 cars, some in garages some being painted some in auction houses, the ones that were taxed were scattered about in our area just parked up, he allways left the docs in the glove box as it was easier for him. according to his friends only 5 were ever found, i expect dvla removed em after a while dodgy garages kept some maybe a few someone claimed who knows lol, deffo a good 50 odd grands worth of cars dissapeared