Info from career Summaries at
www.ww2.dk -
HAILER, Siegfried. 01.09.40 promo to Oblt. 05.41 Oblt., appt Staka 12./KG 3 (to 03.10.41). 15.03.42 Oblt., Stab II./KG 3 MIA - Ju 88 A-4 (5K+FP) vic Rzhev. 01.08.44 officially listed as MIA
ERDTMANN, Günther. (DKG). 11.41 Staka 5./KG 3. 13.11.41 Oblt., 5./KG 3 awarded the DKG. 24.12.43 Oblt., Staka 7./KG 3 KIA - Ju 88 A-4 shot down by friendly AA vic Nauen, W of Berlin.
I couldn't find anything else matching the dates you listed for this or your K.Gr.106 query.
Peter