The last (bottom in this picture) slot should be for the red T handle that releases the electronic shifter and parking brake (or it was on my 2008) in the event of a dead battery and needing to tow the vehicle....I found it humorous that it was in the back where it was inaccessible if the battery was dead as you couldn’t open the tailgates (or even the glove box to get at the manual to figure out how to put the SAV onto a flatbed) and kept mine in the driver’s door pocket for emergency. Perhaps the system has changed in 2012’s and the tool is no longer needed.

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