Remind is defined as take 2 off the sealed deck, choose one for your deck, return the other to the bottom.
Remind all makes no sense, it seems to me. I've seen comments on Reddit suggesting you just take 1 card (in which case it would have been enough to say "remind once") or that you basically unseal everything (which makes no sense either, and "unseal all" would have been better).
We played that we'd go through the sealed deck, 2 cards at a time, taking one and replacing the other. So you got half of your sealed cards back, basically, for each attempt. Seemed like a fair compromise.