Time capsule 727

I am not even sure what I should do about a particular 727.

So I have a 66 polara and it was taken off the road in 1996 due to the transmission going out.

So in 1997 they rebuilt a transmission for the car. I have the receipt and it shows summer of 1997 by the top transmission shop in town. (Still in business)

They placed the rebuilt transmission in the trunk of the car. Probably assuming the swap would happen soon from then. There has never been ATF in it other than to assemble. They also put a brand new torque converter in the trunk, never used and still in the original box.

So time gets away from everyone and here we are, 8/ 2019, 22 years later and the transmission is still in the trunk like a time capsule.

What should I do with it, is it ready to install and run ?

Fill it up and run it.