Just chicken scribble some shit on the pad and enjoy your seeds. THEY DON'T FUCKING KNOW WHAT'S IN THE PACKAGE AT THE POST OFFICE, THE MAILMAN DOESN'T KNOW, IT JUST PASSED THROUGH CUSTOMS WHERE THEY OPENED IT AND IT STILL CAME TO YOUR PLACE. Don't do illegal shit if you're that paranoid.
Sannie implemented this months ago and I'm positive he's had a good amount of orders and no one went jail because of it. You're only signing so Sannie can know you recieved your beans and don't try to scam him on more.