Voss' first aircraft still remains a mystery. It may have been a Albatros D.II, and looking at the
Jasta Boelcke victory log he did indeed score a couple of victories in it. But to this date the aircraft still remains unidentified. Have not seen any photos of it. Also I'm not sure if Voss was even flying while Richthofen was in jasta Boelcke, or if he had left to command jasta 11 by then (the dates escape me at this time). However the Albatros D.I with skull markings on the side and fuselage overpainted green was not flown by Voss, it was flown by Prince Karl (his last name also escapes me at this time) and has been well documented with photos on the Aerodrome at various times, do a search for Prince karl and you should find some useful information.
Hope this helps,
Dave