I have a couple of bits on top of that, such as the Headlines bed and the 1Xtra intro, but that's about it. Does seem very difficult to get hold of.
I messaged Dan once regarding the old 2015 package as I don't have any of that one, as that was quite a large jingle package for newsbeat, so many different beds that only saw the light of day once or twice. Never had a response. But in fairness, he's probably really busy producing etc!