I get a better sense of where you are going from now.

There are lots of areas that fluid will hide from the cooler, to the torque convertor to the pistons and clutch packs etc. Easy to loose a quart in all the little places but all the transmissions will keep the same level relative to the case.

If you can find someone who has their pan off and see how far it is from the pan rail to the tip, and from the tip to the hot mark you can compare it to yours.

That picture shows you how far the tip extends into the pan. If yours is much different than that I would worry.

Another method is to measure the dipstick relative to the end of the tube. They should all be the same because the tubes extend into the case the same amount when installed.

I will try to dig up a tube and dipstick in the next couple days.