[utenigma]

Wow - I might pull the wheel and take a look at the right side, check the part number stamped on the bearing

My guess is the tech did the left side and stopped. Remember these things are meant as camber correction bearings - to fix your car's alignment if it got in an accident. Normally you'd install just one

Or maybe they just put the old part back on accedentially b/c it's new and they couldn't tell, or maybe they picked the wrong part

Or maybe the alignment result is crap - does it pass the obvious test? Park the car on a level surface (verify it's level with a...level), take a long bubble level and orient it up down from the bottom of the tire to the top. Pull the level out a the top until the bubble centers, then measure the distance between the edge of top edge of the tire and where the level's edge now is. Do it on both sides and compare. If the values are the same, the camber is the same (assuming the ground is level)