Apply flawless dwarven logic:+1 and loot that dresser of *Socks*
1. You absolutely have to leave the living quarters and embark to Shielddawn. Your destiny lies there! (and comfortable wooden beds!)
2. You are not allowed to open doors currently.
3. Letting a door stand open would be against the fortress security guidelines.
Deconstruct the door and take it with you as you go in search of the migrant party.
The dresser is empty. Looks like no one lives here, after all.
Not that it's surprising; there are hundreds of free-to-use rooms in the mountainhome, and most dwarves choose theirs at random.
The door is unforbidden.
You suppose no one expected you to tear down the wall.