Damn, Boston. I'm really sorry to hear this. It's gotta be such an awful feeling, especially being your bike.
I didn't realize you lost your keys, too. do you think maybe the keys were dropped on the ground somewhere, and you just idn't see it. Then someone else found them, put 2 and 2 together, and took off with your bike? If the keys are not inside your apartment, then they had to be outside on the ground somewhere.