When disputing shipping-related deductions, it's up to the supplier to prove that the goods were picked up and/or delivered in full and undamaged. Which type of document you need depends on how the order in question was shipped.
Prepaid
With prepaid shipments it is the supplier's responsibility to deliver the goods to the distribution center or store, and so fighting deductions requires proving that the shipment was successfully received. To do this, a signed/stamped Proof of Delivery (POD) document is required.
Collect
Supplier responsibility for Collect shipments ends once the shipment is picked up by the carrier, and so a carrier-signed Bill of Lading (BOL) document is sufficient for disputing a deduction.
Proof of Delivery and Bill of Lading Requirements
In order for a shipping document to be considered valid proof, the document must contain the following information:
the Purchase Order number related to the deduction
the ship-to address of the location from the PO
For a BOL: a carrier signature acknowledging all items were picked up in full
For a POD: a distribution center stamp or store signature acknowledging that all items were received in full, OR a Drop Trailer stamp from the DC acknowledging that the load was dropped in the yard