It's ok, lots of people forget to check so I check them anyway, and if the user that used that page hasn't used it in a bunch of years then I'm cool with it.

Don't forget that the first users signed up in '98 and they're long gone, most of the first names were nice & short so there is a good chance they're not actually in use.

I will still have to go through the logs to see if these don't have backlinks pointing to them, but I assume that isn't the case.