The ones from SGC aren't completely waterproof. I specifically asked if there was any venting for the acid vapors from more acidic cards to escape. They said they weren't sure if it was enough venting, but that theirs weren't completely sealed. I'm fairly sure most PSA slabs aren't completely watertight either. Not sure about Becketts.
A couple years ago a friend of mine gave me an obak he'd found. It was barely a card, more a collection of creases held together in spots by some ink. I set it down either while sorting stuff inhis garage or somewhere here at home, and haven't seen it since.
I don't count the cards I wrecked as a kid. Standups made from 78 Topps, a few suncatcher type things made from cards stuck to tape with the cardboard soaked off....stuff like that.
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