The customers will tell Amazon they never received the items. Amazon will replace them free.
If the items sold were from an FBA seller, Amazon won't eat the cost but will charge back the FBA seller.
The contracted carrier may or may not ever hear about it.
I have only every gotten one package stolen, and it was Amazon store brand Presto paper towels, a value of ~$30. Because it was Amazon brand, I got transferred three times, they flat out said that for their products they need to investigate. They created a case number and had me call back in a week.
Other people I know, and even in this thread talk about how trivial it is for a return. Apparently Amazon only cares about lost packages if they have to actually eat the cost.
I once got a parcel delivered, but the driver was confused as the same tracking number was on two parcels. Amazon had printed an extra label and stuck it onto another package. He just had me pick one of the two.
I picked wrong, and ended up with some window treatments that Amazon refused to collect. I reordered my stuff (which likely went back to Amazon as undeliverable anyway) and that was that.
Amazon just writes it off as a business expense.
https://www.reddit.com/r/AmazonSeller/comments/9d9owl/a_ton_...
This is why I wish they were required to take a picture of all deliveries.
That way I could contact them, have them pull up the picture of the wrong house, and have them compare that to all the other pictures of all the other deliveries.
Then it would be a lot easier to make them either send a new one to the right address, or they have to go to their misdelivered address and pick up that package so that they can send it to me.
Sigh….
Why does this remind me of that old Firefly episode where they steal the medicine from the Alliance hospital. They justify that "the Alliance will have it replaced by the end of the day".
I watched it because I played the awful board game. "This game is awful" I said but the guy who'd bought it insisted it was great because it was so like the TV show. Watched the show, checks out, they've precisely imitated the show's "I don't deserve to suffer the inevitable consequences of my own actions. I am the protagonist in my story so the rules shouldn't apply to me" attitude.