I think there a couple of pieces of the puzzle about Kris that we haven't learned yet. If Jake's investigators were able to find all this out, why haven't the lawyers arguing over the estate in Germany been able to piece this together? Kris has the signet and there is much background information we must await for Mr. Arbour to develop.
As far as burying the report and continuing the pose as a German noble, it may be the best option. Hmmm, I wonder if Brad will wonder if JJ has to be told, and if so to check with JJ's psychiatrist.