Soviet SB-bomber shot down in southern Lake Ladoga 11 November 1942

[Carl-Fredrik Geust]

On 11 November 1942 a Soviet SB-bomber was shot down by ”two Bf 109-fighters” in southern Lake Ladoga, crashing near Morye on the southern Karelian Isthmus. Among the killed on board the SB was the state security official, Commissar 3-rd Rank (equivalent to Lt-General) Pavel Kuprin (head of NKVD Special Department of the Red Army Northern Front).
As no operations of Finnish AF are recorded in this area on 11 Nov 1942, the SB was apparently shot down by fighters from the JG 54 detachment headed by Capt Hans Philipp (based at Petäjärvi, Sakkola on the northern Karelian Isthmus).
Are documents of the Philipp-detachment available, or is this combat recorded in the corresponding Prien-volume (unforunately not available to me)?