I honestly thought we'd eradicated them.* I guess it's most likely that we did, and these new moths are entirely unrelated... But the coincidence of their location is enough to make one go, "hmm..." and begin to wonder...

* My (dim) memory from the time is that we put a few halfhearted mothballs in the piano, and were faintly surprised to notice some weeks later that we'd not seen any caterpillars for a while, whereupon we decided that the problem had solved itself. I don't think huge drastic action was taken... unless Pellinor employed the nuclear option when I was out, and left me blissfully unaware of it.

In other words, the short answer is: we have no idea. Sorry!