Why is postage due on a USPS Flat Rate envelope? | Shipping

pugluv1978 · 2024-10-09T00:08:44.471000Z

I have used Flat Rate envelopes for shoes before without a problem. Today a buyer contacted me stating that she was left a Postage Due slip for $8.20. I of course purchased the postage through eBay, so I am confused as to why this happened? Any insight? And what should I do?

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Why is postage due on a USPS Flat Rate envelope? | Shipping | eBay Community