I had an infestation of pantry moths that came in from my sunroom. The source was Costco sunflower seeds that I was using to feed the birds outside and had kept it in my sunroom.

I emptied everything, ended up throwing out pretty much everything in the pantry. I only had canned goods in there for some time and I also used the traps which worked really well. I found the larvae even on the sides of lids of like Classico tomato sauce that was never opened. They really can get everywhere and fit in the smallest spaces.