I wouldn't worry. Retags are all part of the fun. Searching works for most of them. For the rest, you wait for someone with a very long memory to call you out. And even then, it's not a bad thing. Definitely don't let the possibility of a retag put you off.
Haha, I just assumed that because I can't remember what happened 10 minutes ago, nobody in the world can remember something that happened 10 years ago.
I wouldn't worry. Retags are all part of the fun. Searching works for most of them. For the rest, you wait for someone with a very long memory to call you out. And even then, it's not a bad thing. Definitely don't let the possibility of a retag put you off.