I honestly don't really see this working? What incentive does the delivery driver have to spend more time scanning the box (place the label in view for the barcode scanner), unlock, open the door, place box, relock it

I can 100% imagine the driver just putting the box on top and leaving, or trying quickly to scan and have it fail then again put the box on top.

This is probably the biggest roadblock to this product's success. However BoxLock is in talks with all the major carriers to provide training. The carriers themselves are incentivized to use BoxLock because it provides a guarantee that the package was delivered successfully and securely. They don't want packages stolen either.

You can add delivery instructions to most shipments that tells the delivery driver to use BoxLock.

Neat. Does it somehow know which barcodes belong to your packages, or could a thief rip a barcode off any package and use it to unlock it?

Yes, it knows which packages belong to you. It will only unlock if the package is being delivered to that specific lock and the package is "out for delivery".