Buttons fall off of shirts. That's why essentially every shirt (Gustin's included) has a few extra buttons at the bottom of the front placket. Snip off one of those spares and replace your lost buttons. If you're in a pinch, you don't actually need two at each cuff, so there are technically extras there as well. If you're really in a pinch, I bet Gustin would send you some new buttons if you asked nicely.
3/14/15 at 6:31am