According to the later recollections of Lieutenant Carl Day, Mr Roy Truly told him all about 'the' lunchroom encounter the very afternoon of the assassination.
Lots and lots of photographs in the Depository were taken by Lt. Day. & Det. Studebaker that day. And several photographs of the lunchroom were taken, including this one---------------

Funnily enough, however, given that this was supposedly already on 11/22 the known site of the crucial first post-assassination sighting of the suspect, all the photographs of the lunchroom were taken not on 11/22 but on
11/25:

