Rusty Key

Rusty Key
Information
Source	Gunther (60 Museum donations)
Sell Price	Cannot be sold

The Rusty Key is obtained from Gunther in a cutscene after donating 60 items to the Museum. Its existence is first referenced by Jas and Vincent in a cutscene.

The item can be found in your Wallet in the The Player's Menu on the Skills tab.

It is used to enter The Sewers.