I just bought my first Jeep Wrangler from a dealer, it is a 2015 unlimited sport with a Pro Comp lift installed. In the trunk there was a whole other used Rough Country lift kit in a box. I don't know if it used to be on this Jeep or if the previous owner was going to swap them. Any idea how I can determine the size of the Rough Country lift kit? See photo.

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Well, the Procomp lift is slightly better than the Rough Country lift.

Try to find a part number on something. That should then get you to a place to figure out what you have. I'm guessing it's around 3.5". That appears to be a dual steering stabilizer setup with a drop pitman arm. I certainly wouldn't be putting that setup on my JK. Dropped pitman arms are bad JuJU.

I'm also thinking there is a mix of stock take off parts there. The track bars look stock.

Might get a number off the one of the shocks. Get an extended/collapsed length and compare it to a stock shock. This is working on the assumption the shocks are matched to the lift.