Inbound Parcel Lost at ORF2, Customer support denied claim saying they never received items.

We shipped a parcel of 265 pieces to Amazon Warehouse ORF2. Tracing clearly shows that parcel is delivered to the warehouse. Amazon closed shipment without receiving any items. We filed claim with Customer Support, CASE ID 15872305101, and they clearly denied our claim saying that they "we searched our systems to confirm that the units described in your claim were not located elsewhere in our network. We found no record of these units being received at, or present in, any of our facilities.". We provided complete set of documents. Please help!