Lost and stolen packages

We ship about 200 orders a day with FBM and get at around 4 or 5 messages that the package was not received. The UPS tracking shows the photo and that matches the Google street view in most cases but Amazon doesn’t care because it was shipped on our account. The customer is just refunded with an A-to-Z claim.

I believe most of these are customer fraud/abuse. They’ve figured out how to get free stuff.

How are others dealing with this? I’m considering direct signature on all orders moving forward.