This was played with by a child, but it seems like it was only used about 10 times, so I think there's little deterioration. This is a set of two: the Box Stage Kit and the Jump Kit. The Jump Kit doesn't have its own box; both kits are stored in the Box Stage Kit's box. I checked and there were no missing parts, but there were two balls missing: one red and one blue. For the two sets combined: Large ball: 1 Red balls: 4 Blue balls: 4 However, the actual count is: Large ball: 1 Red balls: 3 Blue balls: 3 I don't think this will affect play, but please consider this and understand before purchasing.