They can also be acquired from sending a dweller to the wasteland and getting a particular quest to do (like a super duper mart). In my case it was super duper mart and I got one Mr Handy box as a reward. Too bad I forgot take footage as proof.
They can also be acquired from sending a dweller to the wasteland and getting a particular quest to do (like a super duper mart). In my case it was super duper mart and I got one Mr Handy box as a reward. Too bad I forgot take footage as proof.