I am pretty sure that rule only counts for bare batteries, in multiples, shipped without equipment.
Your thought process to try to excuse Homeland Security opening not just my package, but the phone itself, is pitiful and most of your posts seem pretty unaware about how the world works.
Enjoy your little bubble where some random regulation about cell phone batteries makes opening a man's private mail justifiable and even makes accessing the internal hardware components of his digital goods ok.
One day you will look around and say "That is what they were talking about!" but it will probably be too late.
"Show me the packaging - shipping phones needs special paper work". Lol. Does your wife have you whupped lie that too? "Muh government needs muh papers". You'll never be useful.