Open a trace request if you have a tracking number. Start the help request form. They will actually respond in one to two weeks.
For example
Our records indicate that this item was delivered as addressed on 06/11/2021 to the freight forwarder contracted by the recipient.
BM Cargo Receipt: WR01-016730743
Once we deliver to them, our responsibility ends and the freight forwarder takes care of exporting the item to the foreign country where the intended recipient resides.
usps.force.com
BM Cargo actually received the package after I submitted the trace request, (it was showing Delivered for a week), a few days after the submission they finally received the package and scanned its receipt in their warehouse.