Well... it's the better way to ship a firearm. Get a VentureOne card and it's a non-issue. Expedited for the cost of regular. A signature is a good idea. It prevents CGN threads complaining about how the delivery person just left firearm on the doors step unattended.
As far as I know, it is a requirement to have a signature.
Before Christmas my Type 81 was left on my doorstep even though a signature was required. I checked the tracking afterwards and the CP courier just scribbled a signature of their own.
Just last week I had the same issue with a restricted, I was having a problem with the carrier in the past so his supervisor already knew about the issues (I had the supervisors email and direct number to depot). Well last week he was running a bit late, I was tracking the shipment via app (Last week the app showed "address verification" and got redelivered a few days later). I saw him loading the community mailbox and was awaiting the walk to my place, but lo and behold he got in his van and started it. I checked the app, there was a signature for the package, but no package. So I ran out there and confronted the driver, told him be better find the package as it was a firearm, and to go get it from where he delivered it to. He said it was in the community mailbox where they give you a key to get to the larger mailboxes (wrong key btw, and anyone with the right key could have gotten the firearm). I asked him who signed for it, he said he didn't know, I told him only one person would have been able to do it, and no one would sign his scanner without receiving a package.
Long story short, his supervisor was contacted. He actually came to my residence with investigations, and they took all the info, and pictures of the box labels. Asked if they could get pictures of the contents, which I allowed them to do. I mentioned that this carrier committed federal mail fraud, and could have placed a restricted firearm in the hands of non-licensed person (yet another federal law), and if nothing was done that I would press charges.
Told they would further investigate it, and the carrier would have a nice little holiday for this if not fired. The carrier has not been seen at my mailbox for a few days now.
I miss my old letter carrier, he knew that if I wasn't around, he would wait until the end of his route in the area, and would check my place again. He knew what we drove and from that could tell when we arrived home. His wife recent passed away, and he is taking a few days off.