Seriously you can’t answer a simple valid question?

The OP has stated they feel for the family at this sad time.

That said, their buyers are most likely not going to connect a road accident (no matter how horrific) with why they did not receive their parcel.

And who are they going to harass?  The OP – who is simply trying to ascertain an answer before it becomes a problem for their business. There is nothing self-centred about this.

OP unless you get better answer, I would wait to see if you get any ‘where is my parcel’ queries.   If they have tracking, I would ask my local post office to track the item (they can sometimes see more track events they we can see on the website.) If you have no tracking, I would ask the manager at your local post office if your missing parcels were likely to have been on the truck due to their destination. If they agree this a possibility, I would include this information on the green complaint form.