I dont mean to agetate this anymore but the front drain holes are in the door jam. Once you open the door, you can see them above the hinge. Usually you can take the end of the hose and pinch it and watch the water run out. The rear ones are just underneath the bumper. The wheels dont need to come off for this job. The car doesnt even need to be jacked up to do this.

But then again, they may have done a tire rotation. Check your paper work.