Problem when car came back from shop

I have taken the car for a cupe more short drives, and every time I check the tranny it is low again. So far I have added 2 full container (They in in 1 liter bottles) It seems like each time I add it the symptoms are less pronounced.

I spoke with my mechanic, and he said he completly drained the tranny, and he suspects that perhaps as the fluid is getting pushed into all the passeges etc, I am having to add more as it was not full.

I will keep on making little easy going trips, and see how it goes. Seems like I might manage to get off cheap after all. Time will tell.