To submit a claim for items exported by post (DHL, FedEx, PostNL etc) you don't need a stamp from customs. Instead you'll need to provide three (3) documents. The 'Proof of Delivery' (POD) is one (1) of them.
The POD is a document which the receiver signs when receiving a shipment in good order and condition. The POD usually contains:
The POD can be found on your shippers website by using your tracking number. Track your shipment to download your POD here;