Now for my next question, I used some spray laquear on one of the boxes I made. It is shiny, but should I buff it too??

That, of course, is up to you. It all depends on what kind of finish you want to put on it. If you are happy with the finish it has now, then leave it. If you want a high gloss mirror finish then you may want to buff it. I usually level the surface before buffing. This can be done with either high grit sandpaper (wet sanding works better here), or steel wool.

Some people use a multi-step buffing system that can level a certain amount of imperfection in the surface. Usually there are three steps of buffing, a somewhat aggressive abrasive, a fine polishing abrasive and a wax. They must be used with separate buffing wheels. Nothing puts a mirror finish on a piece like a properly buffed lacquer finish.