My advice is to treat it as you would any other cartridge bearing unit: ride it until it wears out. If you've ridden the bike and have no noise from the bb, there's not lateral play, etc. then it's functioning properly. Worst case, it wears out faster than it would have otherwise, but it's not going to work at all without symptoms if it's already ruined, so I say go ahead and use it.

Out of curiosity, what kind of bike is it?