That debris is somebodys stuff. going to be an insurance nightmare.
UPS pays for damaged/lost packages all the time. Had a package (1 of 5) be involved in a train derailment. Funny thing was the box (after the claim was paid) actually got delivered 2 weeks later. So some of the stuff was recovered and delivered. Same thing will happen here. You just have to have something to show the value of your shipment (invoice generally).