how do u get Charlatan's copper Ingots and Drifter's copper sheets
by Adding the correct Attunement Dust to the workbench and then use it as catalyst during the crafting process
Atunement Dust of Constitution would be for Drifter and i think Intelligence for Charlatan. you can read more here
Unfortunately the wiki entry for copper ingot does not show this, but it is quite the same as for the Mangled Leather
What do you think?