The first storage box we received included NO side panels! It was annoying because we were counting on using it the following weekend. However, Wayfair's customer service was painless! I reported the issue via e-mail and they sent an entire new unit instead of trying to figure out what we were missing (some of the clips broke too!) Now it's in our backyard, offers lots of storage and is sturdy enough for children and adult to sit on. Thanks, Wayfair!