Privet!
Below are links to Finnish Fighter squardons claims and losses (in Finnish, but you will manage. BTW kesäkuu = June, heinäkuu = July). I did not see any suitable claim during a quick glimpse. Prime suspects for claimant over Ladoga would be squadrons 32 (Curtisses) and 26 (Brewsters). I am not sure if HLeLv 24 or 34 (don't remember offhand which) had Messerschmitts at Olonets area still in June 8th, 1944. They were there during Spring 1944 supporting Curtiss-equipped HLeLv 26 which had hard time against the newly with La-5 equipped Soviet Regiments.
Are you sure you are not looking anti-aircraft artillery claim?
HLeLv 24 (Messerschmitt 109 in June 8th, 1944)
http://fi.wikipedia.org/wiki/Luettel...oimitappioista
HLeLv 28 (Brewster in June 8th, 1944)
http://fi.wikipedia.org/wiki/Luettel...oimitappioista
HLeLv 28 (Morane Saulnier 406 in June 8th, 1944)
http://fi.wikipedia.org/wiki/Luettel...oimitappioista
HLeLv 32 (Curtiss in June 8th, 1944)
http://fi.wikipedia.org/wiki/Luettel...oimitappioista
HLeLv 34 (Messerschmitt 109 in June 8th, 1944)
http://fi.wikipedia.org/wiki/Luettel...oimitappioista
Cheers,
Kari