Antiques

Can the post office put additional postage if I mis-weigh my package w/ already printed shipping label?

I’m selling on ebay. I’m still new at it. I am currently using a very old antique kitchen scale to weigh my packages, but I don’t know if I can really trust it. Can I still print off the shipping labels and if it needs additional postage, they can do that for me when I get to the post office? Like let’s say I was an oz less than what it is, would they … Continue Reading