It looks like you just grabbed the wrong box. This is just regular priority mail...I have some of these from last year. It would say small flat rate box on it if it was a replacement. There are actually a whole bunch of priority mail boxes that you can get. Most of them aren't available at the post office usually.
There's even a normal priority box that is just a smidge bigger than priority flat, I think this one might be called the dvd box or something like that.
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