Okay, thanks for all the thoughts and yes, the mistake was my fault completely....just a typo that didn't get caught.
Doug, renting the other PO Box sounded like a great idea but it was already rented and they couldn't have used it anyway, they have to use the address the campaign in registed under.
Yes, they are required by law to have it on there. The letters are only 1/4" tall on the magnetics and nobody will ever pay attention to them other than other candidates. We've got another candidate locally who has dropped out of his race because he didn't have his disclaimer on his signs and billboards and his opponent was making a stink about it so he was probably going to be left off the ballot anyway.
The problem is resolved anyway. We're going to put a small decal over the PO Box number on the magnetics and we're giving them $100 off. They're going to just use the t-shirts like they are because the disclaimer letters are so small the holes all closed up and you really can't tell if it's a 5 or a 6. The printer had only ordered the business cards and after talking to him he told me he'd do reprints if I'd cover his costs. He told me he was paying $40 per 1000 cards delivered....after hooking him up with a much cheaper wholesaler that's only going to cost me $25. So all in all I'm out $125 and about an hours time....could have been a whole lot worse.