A white material chest is an item in Evony TKR (The King's Return).
The description of White Material Chest in Evony TKR says:
Open to receive a random lv1 Equipment material.
White Material Chest is known to potentially be obtainable from opening Junior Alliance Boss Package, Lv1 Boss Monster Chest and Lv2 Boss Monster Chest. The links for each item are below:
Note: This list may be incomplete.