Two years ago my students sent the team developing the Tesla Bot a letter, together with a bunch of books they thought they'd find useful. They're still waiting for a reply
What part of 'stationary' doesn't Mr. Maynard understand?
Maybe try tweeting at Elon :)
I'm sorry you sent your signed copy on to someone who hasn't bothered to acknowledge the gesture. It could also be the team never found out there was a shipment for them. Either way, AFAIC the only people worthy of a personal gift like that are... well, personal connections. Loved ones and dear friends.