[pct-l] Media mail?

[Deems]

Yes, even magazines aren't considered media mail since they contain 
advertising. Funny since, cds are media mail, but vintage-or-modern paper 
magazines aren't media,,, I get confused easily these days..  I've had to 
pay at the PO for delivered media packages that contained magazines that 
were opened, or broke open during delivery. If  you truly count on getting 
your reload, don't send it via media mail.
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Does anyone know if the post office actually checks packages in any way to
see if there really are books in them?