May they be doomed to get a call like I did some 20 years ago from a large software company I'd consulted for:
"Mike, remember that project you did for us last year? Yeah, we've been shipping it with our product for a while - working great, thanks! Say... I don't suppose you might happen to still have a copy of the source code anywhere? I know, you probably deleted it after the project was over, but you were always so good about making backups - do you suppose you could rummage through your old backup tapes and see if there's anything? No, it's nothing like that! Well, we seem to have lost all our copies of the source and really hope you could help us out."