You can find Rodent Killer bait and the key required to open the traps on the top shelf in the utility closet.
There are six bait traps around the outside of the building.
Use the key to unlock open the top.
Load up the bait area, close the top and move on to the subsequent stops. Put the bait and the key back where you got them.
Interior Locations
These use a different key to pry them open, its brass
Break Room left of exterior door
Break Room between cabinets and fridge
Women's Bathroom under cabinet in big stall
Utility Room under sink
Men's Bathroom big stall corner
Behind furnace in Fulfillment
Left of front door in fulfillment
Behind post in retail area of fulfillment
Front right wall of Rental area
Right of main door in Rental area
Left of main door in Rental area
Left of secondary door in Rental area
Under printer mid way on east wall in Rental Area
Behind furnace in rental area
Under table on north wall in Rental Area
Under black shelves on north wall in Rental Area
Under white shelves on north wall in Rental Area
Northwest corner in Rental Area
Northwest corner in Rental Area
Behind furnace in workshop
Behind metal walls to right of exterior door in workshop