I'm old and don't have a helper.  Such being the case, I made a mistake buying the 200 gallon Suncast deck box.  The tab-into-slot snap together assembly worked fine for the bottom and four side panels but I couldn't get the hinge hardware to fit and I have to lay the lid loose over the top of the box.  The lid is heavy enough to sit atop the box without hard fastening but absent working hinges it's a hassle to open and close.  Moreover, without the rigidity a properly installed lid would give, the UV rays and 3 digit summer temps warp the sides of the box and over time stress the tab/slot connections.  Lesson learned:  if you buy one be sure you have a rubber mallet and a robust helper to help assemble it.