It doesn't matter if anything looks empty- it needs to be legally evacuated.
There's tons of knowledge on the forum about freon removal, equipment, costs, fees to charge, ...
I'd read through these articles. I think you'll learn a lot:
https://www.google.com/search?client...utf-8&oe=utf-8
matador: "I feel like my job is basically the ability to use Google better than some other people"
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