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I don't think that's a very good idea, it's not like new gears are all that expensive to begin with. And, the used gears may have been installed improperly, causing them to have a bad wear pattern, that could give you a problem.
Bad idea. The slight cost savings are not worth the risk. If you know the person and know the car they came from, then maybe. But I still would just get new ones.
Bad Idea, The cost of brand new gears are not high enough to want to take a risk with used gears. If they don't work out the labor cost of changing them again would be more than a couple of sets of new gears.