Hi Simon,
I've gathered a fair bit of information on the subject, and Bunge was one of the III./S.G. 3 men who flew from Courland to Germany (and Sweden and Denmark) on that day. Georg Schlaug and Sven Carlsen write about in their excellent article in Axel Urbanke (ed.),
Luftwaffe im Focus Spezial 2/2006, '8 May 1945: Objective Courland, The Luftwaffe's Last Large-Scale Operation'.
Cheers,
Andrew A.
Air War Publications -
www.airwarpublications.com/earticles