Should I keep my mouth shut at work?

Q: I have a new co-worker that transfered into my area. He was a supervisor in the other area, but had a HUGE rep for being incompetent & lazy. Now that he's over here, he's shirking off things that it's obvious he knows he should be doing. It's not huge things, but it's the "no duh" items that he's not doing & many of us have to clean up after him. When he worked in the other area, he was very well known for shirking duties & walking around chatting up some of the other people in the workplace. The other supervisors who came in after him were constantly cleaning up after him & it's sorta obvious that he was told to come over to our area so they could get rid of him. (Or he decided to come over since we were so "slack" in comparision.) I tried informing my boss about this, but she sorta blew me off. She was nice about it, but she accused me of trying to start trouble & that I shouldn't be talking to the other area about the problems that this guy has been having. I understand that he doesn't have a lot of training & he's only been in this area for a month, but the things he's doing are things that even the newbies can do & pick up on instantly. I really want to tell my boss that these were things that I'd heard BEFORE he'd even come over to our area (he'd worked in the other area for years & I'd never heard anyone say anything good about him). However part of me just says that I should keep my mouth shut since my boss views him as a "golden boy" right now. So should I try to tell her that these were all things people have been saying for years & that he looks like he's starting to behave the same way over here? Or should I keep my mouth shut & let him go back to his old behaviors & let her see for herself? And by "no duh" things, I mean that he's not properly alphabetizing things, not stocking his area, not writing down important client notations, and so on. Rather than alphabetize files correctly, at one point he just slapped them into the drawer haphazardly, which took about a half hour to an hour to properly organize. (And my shift was busy, so it was a pain to have to do this.) He's been a secretary before, but that was a few years ago. Very little has changed since then.

A: Your boss already told you that you're a troublemaker. In that light I suggest you keep quiet and let the boss find out for herself.

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