Painted Key is a miscellaneous Story Item in Act Three.
An elaborately gilded key.
Properties
Miscellaneous Items
Rarity: Story Item
Weight: 0.01 kg / 0.02 lb
Price: 1 gp 
UID
S_LOW_Sewers_AncientChest_00_KeyUUID
6fb666cd-8134-4194-be0d-d42398fd39f0