Stealth boxes need to be balanced and added to uplinks.

[ElectroJr]

#11569 added box entity prototypes, but they are not yet mapped anywhere or otherwise accessible. The normal boxes should probably be craftable or added to maps, while the the stealth/cloaked variant should probably be added to the traitor uplink, though its stealth gain/loss rate might need balancing first.

[keronshb]

I'll be taking care of this after the implant PR.