UPS review: UPS destroyed my property without permission

We took several pieces of original framed artwork created by our father/ grandfather to the UPS store on Tamiami Trail in Sarasota Fl. The pieces were all wrapped and packed by the UPS store staff in 2 separate boxes. One box was delivered timely, the other was not received. We tracked the second box and were told that “All merchandise was not recoverable and was discarded”. UPS made the decision to destroy our property without consent and without notifying us about the damaged shipment! We contacted the UPS shipping store, and they referred us to UPS corporate. UPS corporate sent us back to the UPS store. Since then, we have received a complete run around and still do not understand what happened to cause such damage and why UPS took the liberty to destroy our property without consent. The store owner and team have stopped returning calls and UPS corporate will not do anything to compensate or assist.