An order number or registration number is a number or alpha-numeric number used to identify a customer’s move. This number will vary slightly from carrier to carrier. Arpin of RI’s order numbers start with our agency number 7107, then a hyphen (-) and then a 4-digit number that identifies the specific Arpin of RI customer. The order number is listed on the three main moving forms; the inventory, the Order for Service, and the Bill of Lading.