Nothing apparent in the ORB for that month, I didnt check previous months but he might have been posted out of the Squadron at the time on temporary ferrying duties perhaps.
You could try get your hands on
AIR81/15849
Flight Sergeant D C H Copping: missing believed killed; Kittyhawk ET 574, 260 Squadron, aircraft lost during non operational day flight, between landing ground 09 and landing ground 86, Egypt, 28 June 1942.
And you can apply for his service record via this link:
https://www.apply-deceased-military-...rvice.gov.uk/#
year of birth is 1917