It's been hit and miss with Square Enix's Surprise Boxes in the past so to give you an idea of what MIGHT be inside, here is what I received in the most recent box I bought (2015's Holiday Surprise Box).
NOTE: THIS LIST IS NOT WHAT IS IN THIS CURRENT BOX it is ONLY provided to give you an IDEA of they types of things inside SE's Surprise Boxes!
In 2015's Holiday Surprise Box I received the following for my $9.99, all for Steam:
- FFXIV: A Realm Reborn
- Life is Strange
- Lara Croft and the Temple of Osiris
- Final Fantasy XIII