Edit: Marty provided the link to a page of the old Chestrunners Thread. I pulled the maps from some posts and made an album on imgur. Most are from a post by Glorg from 2012. He saved them from other earlier posts in the thread. They are still available on noelshack.com in his post but I decided saving them and posting them elsewhere too might be wise. Many of the maps are in French, some are in English, you can probably figure out where they are just by how the area looks.
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I don't know if anyone will like the topic but here goes...
Mine is in Raisu Palace (explorable) leaving from Imperial Sanctum. I do it in NM and HM. Drops include Forbidden Staves, Oni Weapons, and best of all NO salvageable armor drops. I guess maybe Shiroken don't wear pants. Map shows my usual route, it does change depending on where chests are. The green dots are possible chest locations in range of the marked route that you can see by holding the alt key in game. (I may have missed a couple dots)