Kill Katie Malone (2010)

When three college students see an online auction for an old box which is said to contain a ghost, they make a bid and win it.  After receiving the box, they open it and find a locket.  They decide to make a wish on the ghost to see if it comes true as this will prove the ghost is real.  Since when do ghosts grant wishes?

When their dorm room is trashed by an unseen force, they are convinced that someone snuck into their room to do it.  Their thought process makes no sense since they were in the room at the time, saw things flying, and no one was there.

When people they dislike start dying, they are unable to make the connection to the ghost box even though the trouble started when the box arrived.  Once a possible connection to the box is mentioned, they dismiss it.

There's not a lot that makes sense in this film.  How can they not suspect a connection between the ghost box and the recent killings since only those who've wronged them die?  Why is selling a ghost box the way to get the ghost back inside, and if it is, why do you need to tell the ghost you've sold the box?  Shouldn't the ghost already know? And if you could buy the box from your father, then why couldn't you sell it back to him, thus trapping the ghost after it got out?

Also I have to mention, when the package is delivered, it is left outside the door to their college dorm room.  First of all, there is no way it wouldn't have been stolen.  Second, University's do not deliver to individual rooms. You usually get a notice in your mailbox, then have to pick it up and sign for it.