I am pretty tech inept LoL but in my fumbling around I discovered an easy way to generate the report.
go to:
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Billing
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View all billing history
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In the upper right click on Export CSV
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You then have the option of choosing dates. Chose Jan 1 - Dec 31.
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You will then have to sum the shipping expenses column,
The report also includes fees for apps used for shipping like Boxify and Amazon Integration Plus.
Hope this helps. Amazon support had no idea.