A little gift
Disclaimer: I own nothing. Don't sue.
It was a well-known fact that Perceptor wasn't the most tactile or social of 'bots. The red Autobot was well known for disappearing into his lab for weeks at a time, only to emerge when Ratchet would storm into said lab and drag the scientist out to make sure he was still functioning. The only Cybertronian who had semi-regular contact with the scientist was Wheeljack, and even then half of those occurrences were because said Autobot had blown up his lab, which blew up Perceptor's wall as well. So, when the Ark crashed on Earth, it didn't really shock anyone that Perceptor stayed