Kevin, regardless of whether you were the original hacker (I don't think you were), a large part of the consensus here is that you did pretty much admit to possessing stolen property. Considering your real name and info is out now (thanks to you yourself), it would probably be in your best interest to wait until things calm down a bit, get in touch with MtGox people, and then PUBLICLY return the funds. Otherwise you'll likely get blacklisted and trolled for years to come. Not saying MtGox people are right, either, but at present only two entities are getting attacked. If I were you, I'd do everything I can to not be one of those any more.
Unless, of course, $12,000 is worth it to have your name remembered and dragged through the mud for the next few years.