I talked to the dude, he’s sold a bunch, Walmart themselves require the signature because the item has high fraud.
I have to agree with this. Anyone that finds they are into the subghz stuff should think about a cheap RTLSDR dongle. Flipper is fun but an SDR plugged into something with a decent screen and CPU is a lot nicer for analyzing signals. They even work with Android devices and are capable of decoding audio.