Open them! But be prepared for some possible bricking. I just bought a few packs of the 1991-92 Stadium Club Hockey set in the past few years and the first and last card in each pack were stuck together, with paper loss.
But there's no way to know until you open them, the storage conditions do play a role with bricking. So they might all be fine.
VERY slow trading due to health problems. Not transferrable so safe to trade with, just moving is painful and can't always access the cards.
Cardboard History My COMC
New Collection Website: Cardboard History Gallery (Still under construction)
Tips on how to make your scans look like the card does in hand (No more washed out, fuzzy scans!):