I'd phone your local post office regarding this and have the manager talk to the driver to verify what happened. I suggest this because my USPS delivery person usually is excellent however one time the tracking number showed a package was delivered to me but actually it was was still in the delivery jeep but mistakenly recorded as delivered.
I'm sorry for your loss, hopefully, the package will show up.
I'm sorry for your loss, hopefully, the package will show up.