I also worked on Y2K at my company and I think I was the only person to discover a Y2K problem in a software package supplied by an outside company that claimed that it was compliant. I was actually explaining to the end user how to devise his own Y2K test plan, so as an example I said, "For example check what happens when you type in something like this." Unbelievably the application immediately went wrong. Purely by chance I had triggered the only fault in that application, which must prove how adept I was at devising tests. Also it was apparently the only fault that we found in packages from external suppliers.
Our company used "golden handcuffs" for Y2K, which were bonuses to be paid out after millennium day if we didn't leave to go to another employer before then as there was so much head hunting of extra IT staff by other companies. Consequently in 2000 I was able to take early retirement with a very generous bonus, but then I had found the one genuine Y2K fault in a whole mass of third party software and it only took me a few seconds!