I went hands on with 3 of the Bosch pumps at pep-boys. The first one said "Made in USA", the second two said "Made in China".

They all looked to be exactly identical pumps, so they may have all been China and someone just marked box 1 wrong. They were all clearly the appropriate pump for the 3.2L merc. All pumps I have handled appear to be identical at this point.

Added data about the Gates pump.