As detailed here
http://forums.spiralknights.com/en/node/67434
I'm trying to get my hands on a starters pack and have been since about 15 minutes after first signing up and logging on.
If I recall what I read properly, the pack goes to the first knight on this account I happen to log in to after it's arrival.
But since I'm waiting for it, I don't know exactly when it will arrive, and I'm thus wondering; am I trapped only logging in to one of my knights until it arrives?
It will go into all 3 knights' mailboxes, but only one of them can accept the items attached. You can log into any of them as you like since taking the items is a voluntary action.