From Ammoland:

Firearms sellers started to receive a new agreement that they must sign to ship firearms through UPS. The letter contains new provisions in addition to the requirements announced last month. The most concerning of these new regulations is that UPS requires gun companies to turn over customer data and must allow UPS access to review and examine the shipper’s books and records relevant to the products being shipped upon request. The shipper must also provide UPS with invoices for any firearms-related products.