Any recent hacked accounts from Southperry users?

As far as i know, the MWLB are just regular players given a special account with a few extra skills and a way to contact GMs. They don't work at Nexon offices, and would have no more chance to obtain data than you or I.
I'm sticking to thinking that hackers are using hacking, not inside job stuff, and not CDs raided from trash cans or whatever.

Where are you getting the fact that they don't work at Nexon offices?

I remember specifically reading that a requirement to be an MWLB is to reside in the greater area of L.A. If it's as simple as just obtaining a special account and not working at their offices, then anyone could just apply, get an account, and go back to where they're from with no real liability to the account. They can sell that account away or give the info to someone else and Nexon would never know. It wouldn't work like this if you're officially working for a corporation.

GM accounts may not be logged on in-game from a computer outside of Nexon offices (as proven before via a hack). I would expect nothing less for MWLB.