SEA is "Steam Early Access".
Luxar, I don't think the physical CE's get keys in the Larian Vault (the one that's there now was a temporary beta one that expired upon release - it was added to make up for the removed dice). The keys are printed on a sheet that's inside the CE box (and I'm somewhat confident the developers didn't go through the trouble of opening every box to retrieve the printed keys and assign them to each person before mailing it off).
