It's challenging to identify lyctid, or other tiny beetles, with only images.

Even so, if they are powderpost beetles (as the very fine powdery frass suggests), the only useful insecticides are borates such as Tim-Bor® and Bora-Care®. Neither is sold in small quantities. Another Ask an Expert response concerning this same issue suggested ordering on the Internet or contacting a specialty chemical supplier.

You might begin your search for local pest control companies which are familiar with treating these beetles. A phone survey could be very productive.