But no proof of delivery, either.We take photos if we can, but add a copy of the notice with an "affidavit" section at the bottom of how and when we delivered it; that should hold up in court.  

The location is a 40 year established location serving as a staging and delivery point with slightly under 900 active post office boxes.  

Can you refuse delivery and let the dealer keep it and let them buy it from you, they can then still sell it as 'new'.  

As one example he managed to turn the simple delivery of a new fridge into a shouting match with him abusing me and the delivery guys.

Maybe so many jobs are eliminated (taxi, bus, delivery drivers; traffic police; traffic courts; stop sign makers, and many others) that the economy completely tanks.What if North Korea manages to nuke its neighbor.  

After mentioning the delivery of a security interest, we presume the Seller somehow is in a lesser position.  

However, it's difficult to prove delivery, without a delivery receipt. 

True, no one an predict what will happen and there are many variables such as the list, the copy you use, the form (letter, postcard), delivery method, etc.  

I made a few phone calls, arranged for delivery of a new fridge and problem fixed.

You also need to use a recorder so you can critique your delivery.