[Mom]

they are so big and heavy the common “missing item” “did not arrive” and “wrong item” possibly won’t work very effectively.

Why won't the DNA method work?

I'm not sure about how it works for OP, but if something is both +$100 and above 30 pounds, most deliveries will refuse to leave until they can hand it over to a live recipient so they can confirm delivery. Anything in that range has more skin in the game and will put the shipper at risk of fault to a non-negligable level.

How it works in my area at least. Weirdly, it has to be both the combo of price and weight. They left my expensive 3D printer out on the porch.