USPS once lost a Priority Mail package being sent to me. Their lousy tracking site said it had been delivered, but our lobby security video showed nothing like it in the hands of the postal carrier on that day. We did receive a small box for the wrong address that day, however. And it was for a non-existent address and non-existent person on our street. (Our company is the only mailing address on our street.)
I filed a claim with the USPS, and their response was essentially, "Sucks to be you." There went $120.