USPS…….HOW MUCH?

if it was in a flat rate box why did it even cross the scales?

go into the PO, grab a box, go to the kiosk punch in your shipping, pay there, get your label, slap it on and put it on the counter. done.

you can also do all of that at home with a USPS account. they'll deliver boxes to you no charge even! print off the shipping label from your printer and schedule it as "click & ship" and the carrier will pick it up from your house on their rounds.

ETA: never mind, i see that you didn't ship in a flat rate. my mistake.