Evidence of Insurance and Proof of Purchase You can provide the mailing label number as evidence of insurance and proof of purchase. The label number (or tracking or article number) is stated on the sales slip, extra service receipt, online label record, or package label. (For the complete list, see DMM 609.3.1.) The printed online label record must clearly identify the following information: The USPS Tracking number of the insured parcel. The total postage paid. The insurance fee paid. The declared value. The declared mailing or shipping date. The origin ZIP Code and delivery ZIP Code, or a printed online label record. For Priority Mail Express COD claims, you must provide both the original Priority Mail Express receipt and the COD receipt; for Registered Mail COD claims, you must provide both the original Registered Mail receipt and the COD receipt.