If the previous keyboard does not work, can I use a replacement?

Hey Everyone, I am getting a Mid 2010 A1342 Macbook tomorrow, and I stupidly went over the line in the description that stated that the keyboard does not in fact work at all. But everything else works just fine. I am assuming that the keyboard controller is on the logic board, and maybe damaged, however, easily the keyboard assembly could also be damaged as well.

I would I go about figuring out if the keyboard assembly is fine and if I need a replacement? and if the Logic Board’s keyboard controller is fine?

Any Answer is appreciated.