Does Hopper know that Steve and Nancy disappeared?

Well, I was rewatching Stranger Things season 2 and I always wondered, how Hopper and the boys always got to the bottom of a whole mess like when they kidnapped Will or the appearance of the mind skinner.

I always wondered, if in the alternate universe of Stranger Things, Hopper and the boys know that Steve, Nancy and Jonathan (I mention it because maybe it's just another survivor or a forgotten memory on Nancy's part) disappeared? As they knew of the existence of the skinner, they did not know of the existence of the entity?

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