On this page of our guide to Psychonauts 2 you can view the locations of all Emotional Baggage appearing in Cruller's Correspondence.
There is a single Emotional Baggage to be found in this level.
Location: Dead Letter Office.
The Tag is at the bookcase. To get to it you'll need to grab the pin and perform a long jump.
Location: International Dead Letter Office.
The Hatbox itself is at the bookcase. Simply enter it and look to your left. The collectible is on top of the parcels.