JG52 as whole, had a rough time during the summer of 1940, so maybe not too much to celebrate with photo ops.
I've found this bit of detailed history of the unit, but is in German:
http://www.lexikon-der-wehrmacht.de/Gliederungen/Jagdgeschwader/JG52.htm
From what google translates, III group (which contains 7th, 8th and 9th staffels) showed only ten victories during the Western campaign, being located on the front from June 9-13, 1940, before being pulled back inside Germany.
July 22nd, they returned to the front, stationing at Coquelles. July 30, again pulled back after only four victories, while they themselves lost seven and one captured. That seems to be it, and looking at the list of 8th staffel airfields, they never returned to the channel front.
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This photo is interesting, though it's of Rall's 109F-4 shot down on the eastern front, November 28th, 1941. It does support the theory of his Emil being coded with a black one when stationed in Coquelles, France. Note the gruppe emblem forward of the cockpit, I'm not sure if it was used in 1940.
regards,
Jack