KEEP OUT is a note left behind if the party changes the print of Baldur's Mouth and leaves undetected.
A plain, unadorned note.
Properties
Notes
Author: Ettvard Needle
Rarity: Common
Weight: 0.1 kg / 0.2 lb
Price: 14 gp 
UID
S_LOW_BaldursMouth_WarningNoteUUID
6dedfb84-b858-4e42-8171-61554ddcc800
Where to find
Found in the basement of Baldur's Mouth at X: -1025 Y: 1031.
Text
KEEP OUT
I don't know who messed with yesterday's edition but I WILL find out.
The Watcher in the Print room has been activated and will attack anyone but me.
-E