Has anyone ever had to put in a claim for a lost light or other item from USPS?Was it foreign or domestic?
Any tips,or good info on how to proceed?
You are going to need paperwork to establish the value of the lost object. It doesn't matter to the USPS how much it was insured for (that only sets the upper limit they will repay), they will still only reimburse the actual value of the item.
Your original receipt, canceled check, credit cards statement, or so on will work.
Also, if the package arrived at the destination, you will need to present the empty package at the post office for their inspection.