A package got delivered that wasn't ordered

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Hi, can anyone try an explain how this could have happened? It's confused my dad.

There was a package delivered today with his full name, address, etc on the box. Inside was an old PC game that was in its box (need for speed 2 special edition).

On the back of the package box is a sender address.

Any idea how this could have happened?

 

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Nevermind, I managed to figure it out. The ebay seller had sold my dad another item that was delivered and he also managed to deliver this game too by mistake, which was meant for another eBay user.