Well, I'm glad that everyone's detective skills seem to be in order, because I also came to the conclusion that Ellen dropped off a birthday package for a Michael, and it was somebody else who mistakenly thought it was me.
I successfully proved my theory by combing the school directory until I found something very interesting: A Michael B. has a birthday exactly one day after mine. That would explain why the gift was left outside of my room the day AFTER my birthday. I asked Michael B. about it, and Ellen is the name of his cousin, so case closed!
...Okay, not really. To be honest, talking to Michael B. was actually part of my initial investigation, and he doesn't know anyone named Ellen. HOWEVER! I can't figure out how to continue the investigation, and it probably IS just a case of mistaken identity as six Michaels live in this building. Nobody wants the truth to get in the way of a good mystery solved, so we're all just going to pretend that's how everything happened. Okay?
Cool, so that means we just solved a mystery! E-cookies for everyone! They're from Oaxaca!