A newly adapted item that was only found previously in patches 2.33 and before.
Acquired from a demolished building.
Old Planks are one of the requirements of a quest in Nuia. Old Planks are acquired from demolishing plots and buildings which have had lumber packs built into them. The Old Planks can be converted into Lumber with one labor point each. This was added in 3.0.
The Recipe to turn Old Planks into Lumber does not appear in the sawmill menu until you have the required components (Old Planks.)
Trion has repeatedly stated that demolishing structures should return 100 Old Planks, but the number seems to randomly vary between 50 and 100.
Missing description on the ingame item.