MyBB Community Forums

I have created the forum long back due to spammers my forum has gone 2500 threads but i have deleted them and kept the forum clean.however still this spammers are creating threads and the url id is still going up.I want to fill that threads by myself or by friends.
I mean i want to fill up those threads by me or by my friends instead of making new threads.
can somebody tell me is their a way we can do or even in phpmyadmin.Their are no threads at all between 100 to 2000 so i want to fill them instead of starting new threads.

What do you mean fill them? Why don't you want to delete the spammer's threads and posts?

I think he wants to recycle the TIDs or reset the counter.

Correct,I want to reset or reuse those thread numbers for new threads
Can you suggest some tips if it can possible.