I'm late to this thread, but I am a new seller and I have encountered an issue with this envelope option as well.
First, when I am listing the item's shipping dimensions as a first class envelope, what do I enter for "thickness". I can only put a zero or a one. So I chose zero.
The estimated cost was still half the cost of a 4oz box using ground service.
However when the item was purchased I was told it would cost me double the estimated amount, even though the info I entered was the same as my original listing.
I pretty much ended up purchasing a label that would be used for a small 4oz package using ground service. Even though it weighed 2oz and was in a small envelope.
What am I doing wrong? Thank you
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