Haven't had the opportunity to test this with other container items, so I'm not sure if IC2 isn't handling their container items properly, or if the Crafting station isn't. Nevertheless! Running the latest versions of both BetterStorage and IC2, when crafting Iron Plates (which was using iron ingots stored within the Crafting Station's "buffer" slots), my hammer has now acquired IMPOSSIBLE DAMAGE.
DUN DUN DUN
From what I can tell, IC2 handles the damage on the hammer the same way any other mod does for a tool: Metadata - not NBTData. Hopefully this helps! :)
Haven't had the opportunity to test this with other container items, so I'm not sure if IC2 isn't handling their container items properly, or if the Crafting station isn't. Nevertheless! Running the latest versions of both BetterStorage and IC2, when crafting Iron Plates (which was using iron ingots stored within the Crafting Station's "buffer" slots), my hammer has now acquired IMPOSSIBLE DAMAGE.
DUN DUN DUN
From what I can tell, IC2 handles the damage on the hammer the same way any other mod does for a tool: Metadata - not NBTData. Hopefully this helps! :)