So from what I can tell, there's the following references:
- Helmet from Skyrim in the box
- Venom Snake's robotic hand from MGSV in the box
- Bandit's ADS from Rainbow 6 Siege in the hands of Mikki
- Pipboy Vaultboy from Fallout
and I'm not sure what else is in the box but I'd like to think that the shape obscured by the speech bubble is the fatboy weapon from fallout or Tachanka's turret from Siege