Missing items from inbound shipment invoice requirement?

From Amazon Help, which should be the first port of call for any queries:

https://sellercentral.amazon.co.uk/help/hub/reference/G201214140

Amazon requires the following documents to be submitted with the research request:

• Proof of inventory ownership: Proof of inventory ownership will help identify any potential discrepancies that may have occurred. Some examples of acceptable documents are an invoice from a supplier, receipt from another seller or signed packing slip if you are a manufacturer. The following information must be provided:
  • Date of purchase
  • Product names matching the missing products
  • Quantity
• Proof of delivery: For LTL or FTL shipments, a bill of lading showing the number of boxes in the shipment and the total weight when it was picked up by the carrier. The document must be stamped by Amazon confirming that the shipment was received and signed for at the fulfilment centre. Your carrier should have a copy of this document. This information helps to verify that the entire shipment was picked up and shipped as expected.

Tip: If you provided a receipt or invoice as proof of inventory ownership, the price you paid for the items is not required and may be hidden or obscured.