Never had a problem...but I suspect that is the luck of the draw. Generally I track the package from the time it is sent/ordered.
I am aware of lost packages, mail by US post office. When I was either ordering parts or sending parts over seas, I used DHL--they seemed to be the best. Recently I had a DHL shipment from UK--went fine. But DHL does seem to do domestic any more--and the offices are few.