Suspicious Documents

Be careful not to lose them, since they cannot be bought from Black Bert.
It looks the same as a Note from the Thieves Guild, an Old Encrypted Text, an Old Piece of Paper, an Old Pirate Poem, a Parchment of Interest, a Piece of Paper, a Piece of Paper (Object), The Alchemists' Formulas and a Translation Scroll. Item temporarily obtained in the Secret Service Quest (CGB).