Oh Elle, I love the Japanese birds!
When I was doing the doll swap, I'd just put them in envelopes, hand them over to Courtney with the addresses and let her address them. Or, I'd just leave them for a day or two, then send them out. By the time I got to putting the addy on them, I forgot which one was which....plus, I would switch the envelopes around every time I saw them.