I went in needing ground shipping on two large packages. Since I had an account number for the recipient they gave me a form and taped my packages together. The form turned out to be for the more costly air freight and one of the packages didn't make it.
My recipient ended up paying too much for shipping and not receiving the entire package which was worth more than the "included" coverage. Thanks for your helpful service postal annex guy!
Pros: nil
Cons: Either they don't know what you need or don't care enough.
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