Hello,
Currently on ebay are two photos of RFC aircraft in German hands at:
Royal Aircraft Factory F.E.2b 5206 of 20 Squadron
https://www.ebay.com/itm/RPPC-Early-...oAAOSwQtZfHgKC
Royal Aircraft Factory F.E.8 A4925 of 41 Squadron
https://www.ebay.com/itm/RPPC-Early-...AAAOSwktNfHgFj
Royal Aircraft Factory F.E.8 A4874 of 40 Squadron
https://www.ebay.com/itm/i116-German...IAAOSwyApcBD0v
Regards,
Clint