You have no concept of how big landfill is. You're not going to find anything. The police spent *several million pounds* looking for a body in landfill last year and didn't find anything.
It would be far better to donate to a gofundme to use deepfake to remake missing episodes.
To help everyone understand how big the landfill could be:
The big landfill used by Niagara Falls that includes, among other things, waste from The Manhattan Projects, is about 34 hectares, or 0.34 km**2. It is about 100m high most of the way. Imagine that you think there is a missing episode *there*.
I am willing to help deep fakes and reworkings from the telesnaps as best we can. I would like anyone who makes them to ask those who saw the originals to help out with the "look and feel" of their deep fakes.
I've seen what can happen to films in metal cans stored in a slightly damp garden shed. Some of the cans had gone rusty and the most badly affected ones had turned to gunge. For a film to survive in a landfill it'd have to be in a watertight container made of a substance that doesn't rust.
There'd have to be a good reason for digging an old dump up, and mid-20th Century landfill isn't of much interest to archaeologists yet. Do we know how many reels of NZ and UK television ended up there?