Item description:

Press R2 and select Thread, Key and Spy

Enter Scriptorium (it's the door on right)
Press X on Toribo and press /\
Move RS down to HIS right hand (where the tear is)
Use “tear” (press R2) with Toribo's tear
Exit out
Press R2 and select “Thief” ["Mystery At The Abbey" popped here for me]
(Reidso's Note: When I tested on another Alt account....
it popped in the same place, but IF for some reason the trophy doesn't
pop for you where it did for me, just contine with the next steps below)
Use chisel with letter E
Press L2 and select E mold, then select E