[8BitRager]

I'll go ahead and provide an answer as to why they do this.
Media Mail.
I worked in the post office for a short while a learned quite a bit. Media mail is classified as any form of digital content or digital players(mp3's, etc).

If a package is sent and is classified, by eBay, as Media Mail, whatever service gets the package to be shipped whether it be DHL, FED EX, UPS, or the USPS, Media Mail is ALWAYS opened to check for legitimacy. And unfortunately, in some cases, they need to go even further into these items to check. An example of that extreme would be a collectible game being put in a large collectors box that holds all of the collectible items.

Why do they check?
Media Mail is typically shipped FOR FREE from eBay. This doesn't include oversea's shipping. Many people try to flag their product as Media Mail to reduce the overall price and avoid shipping. This screws over a lot of companies. Believe it or not, the way things are going right now, the USPS(united States Postal Service(The Blue Eagle People)) will not be in existence any longer within the next 30 years because of the switch to digital in our modern day and because of discrepancies like this. I sympathize for the consumer; it sucks that a collectors Edition gets ripped open.