BA are aware...
Apparently BA maintenance control are aware of the observation - whether that is a result of this thread or another eyewitness report I don’t know.
As Daysleeper has pointed out unless there are obvious flight deck effects or the panel is directly visible from the cabin the chances are the crew won’t know anything has gone missing.
FWIW as a matter of routine the airframe should get at least 2 full external inspections on the turn....