这几句话看看怎么表达得清楚,英文,

This product will be packed every 4 pieces as a whole and the number of the order is 800 sets.
If my understanding is right, please confirm it.
Please be informed that the minumum number for printing by the printing factory is 2000 pcs.
If your order is only 800 sets, we will have to increase the printing number of these boxes, and the remaining boxes will be left for further order(s).