What is this slot on my 2015 GMC Sierra SLE? : rgmcsierra

Chevrolet started with that protrusion which did not need the slot , it still had to face the problem that somebody down in Texas or in California or in

Features - DROP SLOT FOR CASH SALES CASH - Solid steel construction body offers perfect burglary protection - One-way locking bolt

gmc slot Features - DROP SLOT FOR CASH SALES CASH - Solid steel construction body offers perfect burglary protection - One-way locking bolt

gm slot This is obviously solved, but I have never seen that in any GM truck Most likely because I live in Minnesota so there are not many 2WD