I would add that if your not comfortable with doing this then have the mechanic that lost your ATF in the first place take care of it... seems like the least they could do as they were not careful enough to capture the fluid or plug the lines. Have them finish what they started.
Also, as stated above if you feel a problem take care of it for sure. I initially didn't expect that much was lost but now I would park it until corrected.
Also, as stated above if you feel a problem take care of it for sure. I initially didn't expect that much was lost but now I would park it until corrected.