I think there are more conditions than that .
Just for the AMRAAMs :
https://samm.dsca.mil/policy-memoranda/dsca-05-24
Inventory and Accountability Documentation: The Purchaser agrees that all AMRAAM will be 100% inventoried (missile to serial number) on a semi-annual basis. Purchaser will have procedures in place that provide a continuous accounting of missile receipt, transfer, storage, shipment, and/or destruction/ demilitarization. Inventory and accountability documentation maintained by the Purchaser shall be retained throughout the period of ownership and will be made available for review upon USG request.