What is the "Holy Grail" of Luftwaffe Research

[Broncazonk]

I come to this place almost every day and I am always amazed by the incredible amount of time and energy, the knowledge, and the passion that is displayed by the members of this forum. It is amazing that when a photo of an aircraft gets posted there is usually a dozen members who recognize it instantly--down to the manufacturer and W.No.--and also have additional photos of the same plane from different angles.

I've often wondered what everyone's "Holy Grail" is. What critical photo, or important document or record, or scrap of information that the experts on this list are searching and waiting for.

Are there missing photos of Luftwaffe aircraft that people are searching for that, if they were discovered, would answer major questions? What would a "wish list" of Luftwaffe photos look like?

Are there missing documents or records that people are searching for that, if they were discovered, would answer major questions? Is there a "wish list" of missing Luftwaffe documents and records?

What are the unsolved mysteries of Luftwaffe research?

All my best,

Bronc