Cistern in The Ragged Flagon in Riften, appears on a shelf behind the desk after completing 5 Thieves Guild jobs. When using Destroy the Thieves Guild, it will instead be in Bits and Pieces in Solitude, where it can be bought or stolen.

Normal Location

The Ragged Flagon in Riften

Destroy the Thieves Guild Location

Bits and Pieces in Solitude

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