Hi Andrey,
A Do 24 crew was searching for a He 111 in Pl.Qu. 6524 between 06:05 and 10:25 on 3 August 1942. The Do 24 pilot noted that the relevant unit was II./K.G. 26. On an unrelated, note, I'll reply to your emails in the not too distant future - sorry for the delay.
Cheers,
Andrew A.
Air War Publications -
www.airwarpublications.com/earticles