With due respect, the person you spoke to on the phone didn't really answer your questions, per your post. What leads you to the conclusion? From my perspective, it doesn't sound like you know what they were using it for at all, or even if there was an urgent matter that even required it. For all we know, it was just a Tuesday and they were just hunting for the source of a common encryption utility.

And just because a cipher is public does not mean that there does not exist a side channel in the implementation of the ciphers or a mistake in your usage of them.