That was my reaction as well. I get that shipping and insuring expensive things is itself expensive, but that's life. You can't tell a shipper that your stuff is worth one amount, and then demand more if it's lost or damaged.

I think the only case they might have is that security measures taken (regardless of declared value) were substandard. It does seem strange to me that it's considered ok to leave the truck essentially unattended; one driver sleeping inside while the other leaves to get food doesn't count as "attended" in my mind.