One show i was at, a bullx lurcher was sold/passed on 5 times. Honestly 5 times. Kicked out the last lads car because it shit in the car. I took the dog off them. Told them to get the police if they wanted it back,- they did a runner. Couldn't trace the original owner, (not chipped or identifying marks really) so found it a real good home. It was at the Wolsingham show about 4 years or so ago.
It would be quite easy to sell dogs on, i have been asked, if i wanted several lurchers in the past, and could not say for sure, they got them legit. I said no.