I use media mail for any type of media as stated above......primarily books, magazines, etc. The HEAVY stuff. It's always subject to be opened and have had that happen a couple times. Not sure why. Also remember that it doesn't typically travel as fast as first class, so be sure your buyer knows that. Sometimes slow boat but mostly a couple days behind FCM. I've also had it get there quickly before. So basically.....any time in transit seems to work. I don't do a lot of DVD's and CD's so don't know about that.
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