Delivery
T'Challa was unfamiliar with the work of Gordon Parks, but he was obviously fascinated when he picked up the book with kind of a reverence, to flip through the pages. He wanted to study it in more detail later, and planned to, but the first glimpse he took had him feeling pleased with the gift.
It was thoughtful, and he'd have to thank whomever gave him this present - once he figured out who his Secret Santa actually was.