I think those are the reports I've seen. Interesting that Collyns' was so keen to identify the
parachute as German. God forbid that the aircraft with RAF roundels was infact an RAF aircraft!
Both Boon and Collyns had been prewarned about a spuriously marked enemy aircraft. Any psychologist will be able to tell you about people seeing what they are expecting to see.
Dinsdale saw no roundels and is much more circumspect about the stripes.
There is a famous picture of an Me163 dumping fuel prior to the pilot (Fritz Kelb) bailing out. It looks for all the world to be marked with roundels whereas it is actually marked with white outline Balkenkreuz
It is imposible to discount or confirm these accounts today. I certainly believe the reports,they honestly reported what they thought they had seen.I would treat them with caution,that's all.
Cheers
Steve