As far as I know it's not possible to make a sign outdoors.. For outdoor signs you can use patterns. People have been doing ACCF olympic games since the start so it really isn't a new concept . Lastly people visiting hacked town specifically looking for items tend to either want a ridiculous amount of bells, a ridiculous amount of items, or items that are hacked and harder to trade on some AC boards. I honestly don't think they'd care either way if it's a slew of 'old' items or a slew of new ones