I have used moth balls in airtight plastic containers, but some recommend baking soda. One taxidermist recommends Raid Fumigator to kill dermestid carpet beetle larva feed on the protein in fur, feathers, bones, etc. When using it, you lock the house and leave for about three hours and then air it out, but probably not the easiest solution for the middle of winter.
Some have used cedar wood chips in containers with success. The Raid Fumigator goes in a plastic cup with water that creates a dry fog that will kill whatever eats your feathers, mounts, etc. An article that I read in a fly tying magazine recommends putting newly acquired fur, hair, feathers in a garbage bag in the freezer for a week, before using.
So, what have you used with good results.
Also, Borax with feathers, fur, hair and hides, skins etc. The larva is feeding on the protein in your stash and anything you buy, or bring home from a hunt, or road kill?? should be clean and dry. Avoid a disaster by using a process that works.