When looking for my Eddie, I did look at some that had stamps, no record, or no stamps, but had details on VW system.
Often found the easy way to find the true history was to contact the main dealers, or VW UK who can verify.
Im lucky that I have every invoice since new for all the service/warranty work and a full list from VW off all the times it has visited a dealership in its life, even down to it having the seat coverings replaced as the owner wasn't happy with the stiching. I know its been looked after