Welcome to a couple of years ago.
Amazon has been doing lots of small item shipments for DVDs, movies and games in the infamous BA2 bubble mailer, as well as larger bubble mailers.
Some fulfillment centers are more apt to do that than others, though as most of my shipments come from the Coffeyville, KS center, they're very likely to do it.
As other people have said, they sometimes ship items in boxes much larger than necessary, so the item happily bounces around in shipment.
Games and movies should be packaged with a vacuum-sealed plastic sheet attached to a cardboard backer board and put in an A0 or A1 shipping box.
If you've had an issue with the item damaged in shipment, Amazon will replace it for you without any cost on return shipping as well as for the one-day shipping of the item's replacement. If you have it happen more than once for the same item, you might have a CS rep give you the option for a second time, and if that still gets damaged, they won't reship it a third time.
I've had this issue off and on over the years, and complained up to their executive resolution team over this issue. It'll happen, even though it shouldn't happen with someone taking the time to properly pack an item in a box.
If the order isn't more than 90 days old, you can file Packaging Feedback on the order, which allows you to comment on how the item was packaged, include up to a 800 character comment about the issue, as well as pictures of the damage. I strongly urge anyone that has improper packaging to use that tool every time they have an issue with it. There is a limit on the number of times in a 60-day period that you can do packaging feedback, though you should do it on any package that wasn't packaged properly.