Libby, I don't know what Chinchillas eat, but check the food if it is seeds of any kind. About a month ago, I bought seed to mix with the pellets I feed my Cockatiels. Something hatched and I had moths everywhere in my office. It was in that food. I have started freezing the food for two days after I buy it. Apparently this is not at all uncommon and many of my "bird" friends suggested that it can happen anytime there is seed involved.

Good luck.