What do we know about the mystery sender? Not much, to be honest. They have the ability to send messages via bird. They presumably know where the mystery man lives (unless they cast a spell on the bird to find him no matter what...). And … that's about it. After all, we don't even really know when the opening scene took place in the timeline — it's possible that it's set slightly after the rest of the episode, in which case any of the characters may have found a moment to send the bird off.
Given that, who do we think it might be? Well, that partially depends on who the mystery man is. But here are a few theories that make sense to us.
August. If August/Pinocchio (Eion Bailey) is alive, he's a good candidate. After all, he actually lived outside Storybrooke for most of his life, so he very well could know the mystery man. If the mystery man is another Fairytale Land character (or a character from some other world), they may have found and befriended each other at some point before the series; the mystery man could have been aware of August's plan to get Emma (Jennifer Morrison) to break the curse. Maybe the postcard is August telling the mystery man he succeeded. Plus, we didn't see August all episode, so who knows what he was up to.
Jefferson. Jefferson (Sebastian Stan) knew about the curse all along, and has his own plans we're not fully aware of. Like August, he was MIA in the premiere, and very well could have been off sending messages. The mystery man had a "Cleaner and Hatters" sign in his room, suggesting he could be connected to Wonderland and not Fairytale Land — some are speculating that he's the White Rabbit, who can travel between worlds in Alice in Wonderland.
Mr. Gold. You can never discount Mr. Gold/Rumplestiltskin (Robert Carlyle) and his endless plots. It's possible he found a way to contact the outside. Or maybe, as we mentioned above, he enchanted the bird to find his target without knowing where that target was — this could make sense with the theory that the mystery man is Rumple's son, Baelfire.
The curse itself. Who says it has to be a person? We wouldn't put it past the curse to be able to magically send out that message automatically when it broke.
Charming or Snow. We don't know why, and we don't know when either of these characters would send such a message. But it's worth noting that Charming (Josh Dallas) and Snow White (Ginnifer Goodwin) seemed to have a special connection with birds back in Fairytale Land.
Who do you think sent the message? Let us know in the comments below!
Catch the next new episode of Once Upon a Time on Sunday, October 7 at 8 p.m. ET/PT onABC.
Rebecca Martin is an editor at Wetpaint Entertainment. Follow her on Twitter@BeccaMartin47.