Has anyone ever unlocked a service swapped AT&T iPhone?

My wife's 4S would normally have been eligible for AT&T unlock 11/2013. The process is normally straightforward, I've unlocked 3-4 of our AT&T iPhones post contract expiration.

There's a catch though. She broke her screen, and since I wanted a new battery I paid for a service swap instead of a screen repair. (Sadly, the service swap (same as a refurb I think) had a defective "audio compiler ic" and itself had to be service swapped.)

The problem, of course, is that we now have a different phone from our original AT&T purchase. So although we'll be eligible for unlock, I suspect we'll have problems.

So my question -- has anyone ever successfully unlocked a services swapped AT&T iPhone?