What's the canonical source for patches to 2.9BSD and 2.11BSD?

I see we have 2.11BSD patch 469 dated last month in the archive. Where does it come from? Has anybody climbed the hill to import all the patches into a git repo? I've found some mirrors, but has been down for me for ages... How does Warren keep things up to date?

I also have a (maybe faulty) memory of a similar series of patches to 2.9BSD because it was the last BSD to support non-split I&D space machines. yet a quick google search turns up nothing other than a set of patches dated August 1985 (also in our archive) and some changes for variants of hardware (pro, mscp). Is that it?