You can certainly file a compalint about them violating protocol but it will probably mean the lose of your job. An employer can fire you for any reason or no reason at all.
QF does come in a 3 ounce bottle if you want to have the extra. 2 ounces is all thats required by law. But I've been in the same situation before. I just used a little of my heavily dilluted urine to top the cup off.