Well all this just became moot. My manager has said to stop trying to find the code. She's going to go and admit to the business unit that we lost the code and suggest either we rewrite the app (which has been slated to happen for a while anyway- in fact, it's why I was hired) or do full regression testing with the users. If they choose the latter it'll be very interesting because this app is so buggy it never made it out of QA in the first place.

I've been pushing for testing anyway because I hate making changes to apps without being able to ensure that the functionality hasn't changed, so I'm relatively pleased. I feel bad for my manger- even though I don't care for her very much, she wasn't around when this source was written (and lost apparently) but she'll get her head handed to her when she talks to the business unit.