So, I'm one of the lucky ones who gets to pay the government taxes this year.. I've already e-filed so the return is filed.. I cut a couple checks to my state and federal for payment and dropped it off in a drop box at the post office. I didn't actually hand it to anyone but I saw others dropping off their taxes in the same drop boxes. Will it be posted marked today?? If not, should I be OK since its just the payment and I've already filed?? or Will I probably be charged a penalty?? I checked online for post offices around me with extended hours and none of them had any..