Albert,
Vern has trained his eyes intensively to spot fakes and flaws...perhaps overtrained!!!
He and Pete Ebbink (he even calls himself "Paranoid Pete") have unmasked several fakes over the past few years. But they, like us, are not infallible and the fact that they do miss one now and then is no great condemnation. I am not shy about disagreeing with them. Sometimes they convert my opinion, and I think they may have agreed with me once or twice...but not without a struggle.