making insurance claim at post office when you've lost your insurance receipt...

I recently purchased some relatively pricey computer speakers online. To my dismay, they were defective and I returned them. I sent them back via the US postal service, parcel post. I put $150 of insurance on them. Well, I’m becoming concerned because its been just shy of two weeks (they told me it would take about 5 days), and the company still hasnt received them. And to make matters worse, I seem to have misplaced my insurance stub. Am I totally screwed? I remember the exact day, time, weight, and of course how much insurance I put on them. If I go to the post office, will they have that informationon record, or will they smugly tell me to get bent?

At the same time, It makes me wonder how they could lose a huge, heavy box with the address clearly laminated.

Thanks for any responses!

The Better Half came home for lunch and I ran your question past him. His response: