280010 should been assembled in about June/July 43 (my calc./interpolation)
280010 Ju 188 F-1 [NK+ZG] 9./KG 40 (Luftflotte 3)
OPS (F) missing (100%) unk location 04.12.1943 (F Ofw. Otto Langner, B Fw. Werner Walter, BF Uffz. Peter Jansen, BF Obgefr. Erich Kobina <amd g/15.12.43> and BM Ofw. Fritz Törner mis)
[rep Ju 188 280010 NK+ZG in LWFLV losses 10v09.12.43; amd 280010 - unit III/KG 40 lists no Ju 188 on strength in that month - nor any other month! Photos of this ´test´ machine are known ´as taken at Bordeaux / Merignac Airfield´ - same photo in Robert Michulec “Ju 188 Ju 388” Pt.1 (English Text) P.19. - Rep used by Horch und Störstaffel 2 over the Bay of Biscay, stated in Barry Rosch {Classic Luftwaffe Colours} “Luftwaffe Support Units”]