Who is bike guard?

I received three new Kryptonite locks - two replacements for Kryptoloks (the regular $30 kind) and a replacement for my mini. I carry two keys on me, one for the mini and another for yet another lock I have, the New York u-lock which held me over while all my other locks were out for replacement. I've mistakenly put the keys into each other's locks and they won't go.