So all I need is a Small Flat Rate priority box, one priority mail stamp $5.60, a label 400 and drop it off at any USPS blue box? I know that the blue boxes say if it is over 13oz and has stamps you have to go in to drop it off. My package will be under 13oz but will have a priority mail stamp. Can I just use any blue box?
$5.75 for priority now. Unless you wanna have problems.