We’ve assumed the key was for a locked box that Bae’s old sword was in, but it could have been a key for anything, really.
I’m still scratching my head over the key that Adam tweeted with the “Good Form” title. It’s the same apple key that Regina used to unlock Mary Margaret’s apartment to frame her for a fake murder in S1. Yet, why would the apple key be linked to Hook? My first thought was to just to call Adam a troll, but now that we have a photo of Hook holding a key in 3×1, I’m not so sure. Curiouser and curiouser.
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy