The first 4 Ju88C-6 prototypes?

[Mauser98]

Several Ju88 info pages including wiki claim that "the first four C-6 night fighters were tested in early 1942 by NJG 2". Most likely in the area surrounding Gilze-Rijen.

Another article says: "On November 15 1941 I./NJG 2 commanded by Hptm. Emil Jung arrived at the Sicilian airfield Catania. Initially six Ju 88C-6s of 2. Staffel were on detachment to Benghazi, but they returned to Catania on November 28."

I have reason to believe that 4 (maybe 5) early C-6 versions were assigned to III./NJG 2 on Jan/feb 1942 and tested by crews from Erg.St., both stationed at Gilze-Rijen around that time. One of those planes crashed as early as February 17 1942 (R4+LR) when 7th staffel was not yet officially formed (?) is this the first known C-6 that was lost?

I would love to get more info on those early C-6's or perhaps some suggestions (logs, books, etc.) where i should look to find some leads. Any help is more than welcome!

Greetings Philip