Carry two GIANT boxes stacked on on top of the other WAY taller than myself down 3 flights of stairs to car? Check.
Load 2 door coupe car with two GIANT boxes? Check.
Drive to Post Office? Check.
Wraggle two GIANT boxes back OUT of 2 door coupe? Check.
Carry two GIANT boxes stacked on on top of the other WAY taller than myself to the line at the post office? Check.
Successfully get both boxes mailed? Check.
Achievement unlocked: Swap Mailed!