Does steve's ex-boss know it was him?

Back in December 2007 Steve wrote and mailed a very damaging letter about his ex-boss to the CEO (at the main headquarters). In addition Steve emailed the letter to the second and third in command and followed up the emails with phone calls. You see this ex-boss harasses staff, customers and lied to get Steve fired.

Then about two weeks ago Steve decided that he wanted to make sure that the CEO actually read the letter so he obtained the CEO’s home address and mailed a copy of the letter to the CEO’s home.

Then LAST WEEK Steve at the urging of one of his ex-coworkers wife filed a complaint with the EEOC.

Steve is not a disgruntled employee. He knows he can get a job somewhere else, but he did all these things for his ex-coworkers because he knew the ex-bosses behavior could not go on and he knew he was the one who could get the higher-ups attention because Steve is no longer at the company.

My question is when Steve’s ex-boss had his yearly review (which was last week) what did they tell the ex-boss and who reviews the ex-boss? Steve spoke to two ex-coworkers and they said since the ex-bosses review the ex-boss is more mellow and does not bother the staff or customers and his on his best behavior.

Also another question: Does Steve’s ex-boss know it was Steve who wrote the damaging (extremely damaging) letter about the ex-boss.

How are we supposed to know? Given the situation I'd think 'Steve' and/or some of the others would make a point to not name names, but you never know, the ex-boss might have found out somehow.

Oh thanks a lot.