[Nick Beale]

The period is covered by the Quartermaster General's loss reports which are at the Freiburg Bundesarchiv (on paper) or the Imperial War Museum (on microfilm). There are books which might have some of the information you want but there's nothing yet (AFAIK) that gives the whole picture.

In Southern Italy at that time Luftwaffe aircraft might appear from Italy-based bomber or reconnaissance units, torpedo bombers based in Southern France and bombers and recon in Yugoslavia and Greece.

If prisoners were taken from shot down aircraft, the UK National Archives have the interrogation reports (the odd one is missing) and I think the US Archives will have them too.