I have Fallout Shelter on two devices- PC and phone. At some point on both of these devices I received a free kind of Lunchbox which gave me one pet. This was before I got 13 people in my Vault. No matter how many game files I start, I have only ever received one on each device. How does this work? What are my chances, if any, of getting a second?
The Fallout Shelter save games are not particularly robust against editing. It is actually JSON formatted.
You can also just edit in more Pet Carriers using Fallout Shelter Save Editor