Any board can take on boxes, especially if you're just doing 50/50s. What make/model is your board? An ultra stiff, super responsive, big mountain board is less than ideal for jibbing, but it can still be done. What exactly happened when you attempted the box? What were you trying to do? Did you try it more than once? Was the feature ride on, gap to, ollie on, etc? More details will help us help you, but here are some generic tips.
Have your trajectory set BEFORE entering the feature. Aim for the end of it, not the beginning. Maintain a flat board while sliding the feature -- NO EDGING. If you slide off early, no big deal, your aim was off. It's not as cool as sliding to the end, but it's still cooler than falling, which WILL happen if you try to save it. Relax.