Using MultiMC, mod files where they're supposed to be and other mods that require fabric are loading fine.
I can see the chests in creative mode on their own tab, but I can't craft copper chest to start in Survival.
There are no errors in any of MMC's logs (obviously, since it's loading), so I have no clue what else I could provide to help figure out what could be going on. Does it need to load before something else?

Closing - Apparently MultiMC still had another chest mod loaded and they were conflicting (but throwing no errors...), so neither of them were working.