Haneda Domestic Terminal

Daniel-san,
We arrive in Haneda International at night. We fly to Kumamoto the next afternoon. We don't need the rail passes we have purchased until a couple of more days. Is there an exchange counter at Haneda Domestic (where we will be during working hours before our flight to Kumamoto)? If we have to go back to the international terminal to pick up our rail passes, please explain the details of going back and forth between terminals, particularly without plane transfer documents. I have noticed in another post that the exchange desk at the international terminal can be reached (by arriving passengers) before customs. Does this mean we have to go through security or other formalities to reach it if we are coming just to pick up the passes?
Thank you in advance for any help you can give.