EDIT: I emailed them a complaint, they sent the following:
I have made several phone calls to trusted people in the padding industry. I know that you are not supposed to put anything down on newly polyurethaned floors for at least 6 months to let them cure. Unfortunately, there is nothing written on the pads, and nothing written in any of the stores that sell these pads (not just Building #19, but Home Goods, Macy's, Bloomingdale's, etc) about that fact. All of the padding people say that the person who polyurethaned the floors should have told you. Even if you put a rug down, the color will change because of the difference between light and dark (under the rug). Maybe some policy should change in the padding industry. I'll see what I can stir up.
Of course, you can return the pads. If you have any problem, have the store call me.