It was black tea flavored with spices, so they could have gotten into it for the spices maybe? But it was definitely moths.

And the traps really helped me. The ones I bought last about six weeks and one is sufficient for a whole room, so no hassle with having to put one in every cabinet. I have now the second set, and there are fewer moths caught on these than on the previous ones and I don't see adult moths fluttering around every evening anymore either.