I have always used Sallie Mae for my bacholors and now Masters degree. But when I consolidated my SL's into one payment. Sallie Mae still have those other accounts stating that it was transfered (paid on time no baddies).

My question is: Should I ask Sallie Mae to delete all of those transfers; since it's consolidated on one account now? Or should I leave well enough alone?

The U/L loans on a consol must be accurately reported, positive or not. SLM won't negotiate anyway.