Just so you know, I have three of these now and I don't think I've ever used the screws to fasten the legs. Just snapped them into place and moved it to wherever it was supposed to go.
Please know, I place nothing heavy on top of them nor would I ever dream of sitting on one but if you are having problems lining up the screws I wouldn't sweat it too much. Mine have been fine for years.
Enjoy your purchase!