There’s a wide variety of items in the game that i haven’t yet found a use for, or a way to sell. I’m aware its quite likely that many of these simply don’t have a purpose yet, but some probably do;
Searing Enigma
Savage Secret
Tale of Terror
Caged Catch
Bundle of Immaculate souls
Cryptic Benefactor
Ministry Stamped Permits
Will post about others if i remember them.
If you guys are aware of any uses currently in the game for these items - or any place they can be sold, let me know edited by Nanako on 11/23/2017
Enigmas can be used to craft Impossible Theorems, and are required around the middle of SMEN to obtain an item necessary to the plot. They can be sold from the Bazaar.
I’ve never even heard of a "Savage Secret".
Tales of Terror actually have a fair number of uses as the game progresses, and can also be upconverted into Uncanny Inculabula.
I’ve never heard of any of the remaining four items either. Are they fate-locked, perhaps?