Received a previously returned product, red quality control label stated this on outer box. Couldn't use keyboard tray as runners were previously put together incorrectly and I can guess this was why it was returned. Heads on some screws broke off when fitting. Melamine where the monitor stand attached was broken, cracked and loose. Why sell on second-hand/returned products? The quality control label may have confirmed all contents were still enclosed but nobody checked if those contents worked or were of satisfactory quality to sell on! I won't be purchasing again!