Board Thread:Current Major Glitch Discussion/@comment-35959130-20181217161852/@comment-216.16.10.30-20181217220350

Here's the list of the one-off items: http://the-secret-society.wikia.com/wiki/List_of_One-Off_Item_Quests

A proven strategy - 1) Get the room into the required mode 2) Leave it alone for 24-48 hours 3) Use a horseshoe and hire 4 sleuths

With the chance set at 15%, it'll be a tough nut to crack.