12 squadron Pilsen raid April 16/17 1943

I am looking for vetrans or famillies thereof who flew on the Skoda works raid of 16/17th April 43. I have been researching this op for several years and have all the well known published material. However I am still missing the names of three crews and a/c (9 a/c took part)from this op from 12 sqn. All the ops records for April 43 for 12 sqn are missing from the national archives UK and, Wickenby museum, and Air Historical branch, and the present day 12 sqn! Does anyone have copies of the ops records for 16/17th April 43 made before they went missing?

Any help would be very much appreciated.
Peter