Yes we have to document which junk pile we found stuff in and why it was there in the first place :-)
Much of the hardware of the 0579 project was found in the Chama swamp, even though there hadn't been a short caboose in town for a long time. Other parts came from a Boulder warehouse.
Sometimes we need to be careful how we interpret that policy. About 30 years ago I incurred the wrath of an ex-Rio Grande Car Shop Supervisor, because one of the projects used "deck screws" to fasten down a running board. The rational by the project leader (not me, I was just the messenger) was that "The ''Grande would have used whatever was laying around, and we happened to have this bag of deck screws..." Hopefully we've gotten way past that type of thinking.
Bill Kepner