It's impossible to prove that these allegations were false. So there's no reputation to lose. The only ways i can think of to prove innocence (in general) are

It's impossible to prove that these allegations were false. So there's no reputation to lose. The only ways i can think of to prove innocence (in general) are a) an alibi b) finding who actually did it. Both of these don't work here, you can't have an alibi for the whole company for 10 years, obviously. You can't find out who did "it" because there's no concrete example. At the very best you can prove that others did it too.