[Gunnr]

I agree with This: This might be his first day on the job at the mines(post sewing the eyes shut). Those look like mining tools he is carrying.

As for the Numbers on his chest. Numbers are a good way of keeping track of a mud if one is traded or sent to another job. Given that mud's start working when they are children/mudlings. "BB" could have gone from Rupture farms to Nec mines prior to Abe shutting it down, which would explain how Alf knows him when they work in different places.

Of course he could also be on his way to be shot like mentioned above, with his belongings waiting to be claimed by the next worker after his.. termination.