What I got was, indeed, a 64oz container of cheese-flavored powder, but it was more like cheese-flavored salt. I guess it was for seasoning popcorn or something...more like cheese-flavored salt

Flavacol?

I have a carton half that I think is half that size that will probably outlast me. Every now and again, I refill a salt shaker with it.

If that's what it is yeah, I don't dislike it, but it's definitely far from being what I'd call the most-critical component of nice popcorn.

I think that that plus coconut oil is probably authentic, but I'm not married to movie-theater popcorn, so I don't care much about authenticity.

What I did wind up doing was getting an oil sprayer and spraying chili oil mixed with olive oil to bring down the heat, and then putting Flavacol on. Can add some other powdered seasonings to that, but just the above works pretty well for me.

Reminds me of this big screen TV I used to have. Got it for like $20 and was so happy with the purchase...until I had to get it home.

It was one of those giant CRT rear-projection TVs that was the size of a wardrobe and weighed twice as much. I lived on a 3rd floor apartment. My friends hated me...until we finally fired up Halo on the Xbox lol.