As someone who worked in the courier business and dealt with damaged packages, it looks like the end was torn off when it was opened. If it was damaged in transit, usually what happens is that something heavy was placed on top of it, and the box would appear crushed. That one looks like someone grabbed it by the corner where there is commonly a hole, and pulled. Commonly a box is opened that way when the person doesn't have a knife to cut the tape. Most of the time, this is done one of 3 places:

1) The receiver, trying to pull a fast one.
2) Somewhere in the postal system...
3) The box is left in an insecure place and someone comes along and rips open the box to steal the contents.

These are in the order of frequency of occurrence, they are ordered this way only because if the box is left in an insecure area, thieves will simply take the whole box, rip it open and dump the box in a dumpster somewhere. They don't leave the open box on the doorstep, because it lengthens the time they are in the process of stealing, and that lengths the time they could get caught.

Surprisingly little stuff gets stolen during the carrier process, for a simple reason, it's too risky. Getting caught means your automatically fired, and the union is happy to let you twist in the wind, often the carrier will have you charged by the local constabulary. So not only do you get a police record, you lose a good job that pays well and has decent benefits, even though you don't require a degree. Not only that, but it's the one area where the union encourages members to "rat" on co-workers, and carriers will often pay bonuses for reporting a co-worker. I think where I worked it was $100 for reporting an employee theft, didn't matter if the item stolen was work less then $100.

I worked as a delivery person, if a box was damaged, there were 3 known options:

1) Refuse delivery, on the scanner was a place for a reason, for example "box damaged".
2) Accept it, as damaged, the driver puts on a comment "box damaged" before the receiver signs for it.
3) Accept it, as is.

I lot of delivery people would really use options 1 and 2 only, to cover their own tail, and it was also making it clear that if the receiver complained to the sender, that the box was damaged before it was received, for insurance purposes. As a sorter, if it was damaged, it was sent on, it's up to the delivery person and receiver to work this out. As the sender I would run the package number or B/L number and see if the delivery person put any comments on the delivery. Generally it's up to the sender to file a claim with the carrier. The photos are not really helpful in that it looks like it was opened rather then damaged. As a sorter, I would not load an opened box, that was put aside and a manager or supervisor called over, because if I handle it, then I take responsibility for it. There was an exception, retail stock, stores wanted there stuff anyway and didn't care, so if a box was damaged or opened, it would be taped and loaded, because that's the way they wanted it.