Matthew Roberts (the guy who posts those monthly Apple Park drone construction videos):

A drone crashed into Apple Park over the weekend. The drone pilot got in touch with me shortly after the incident to inquire if I could assist in locating the downed drone. I was happy to oblige, so I took a Phantom 4 Pro out and began searching for it. It was eventually located on the Solar Roof and appeared to be intact for the most part.

The drone operator has gotten in touch with Apple and notified them of the drone crash and it remains to be seen, whether the operator will get his crashed drone back.

The video has (very choppy) footage of the drone going down. When I first saw this, I was reminded of all those times I knocked on neighbors doors to get back baseballs, footballs, and frisbees that landed in their yard or on their roof. Never a drone though.