I've observed a few problems to paper and the printers lately. Please note:the top-left bin of the HH-403 and HH-303 racks (the one with "Scap Paper" written on it :) is for scrap paper, not printouts;
the paper trays are not meant to be a source of scrap paper; try the rack bins marked "Scrap Paper";
if there is no paper in the HH-303 printer cabinet, check just inside the door of HH-303 before heading upstairs or down to fetch some from elsewhere;
if the printer reports a paper jam, just follow the instructions - they are usually accurate and precise.