Ever since Covid (and for some long before), ammo deliveries from many online retailers have been asking for signatures, stated at time of sale. However, only once in 2 years has a driver actually asked me for a signature, all other deliveries were left on my porch. It has been a pain, making sure I'm home, then the driver ends up NOT getting a signature. It has been very inconsistent...although most online sources tell you up front that a signature will be required. When it becomes an issue, I'll have my packages delivered to my branch office. I don't remember any ammo ever coming via USPS...
I buy 90% of my ammo online in case quantities...