When I used to set up at all the card shows I had one of the best unopened card selections at the show.

I watched many people pull top dollar rookie cards from packs at my table as many of the packs I sold came directly out of full boxes.

I was always careful when buying for my collection and would rarely buy an older pack without knowing he seller and making sure it was real.

Those were the days before slabbing and I have never sold a slabbed pack.

By the way, I have seen a huge amount of questionable material that has been slabbed that I feel have been resealed so even that is not a guarantee anymore.