I'm sure I have seen occupations as Dipper in Tin Works - and given Redbrook's association I wonder ..........

A dipper was involved in making tin boxes, canisters, etc. by dipping the
seams and ends of tins in acid then in a small bath of solder to make the
joints.
A sorter, aka assorter, (tin boxes), sorted the tin plates, and/or
inspected the finished boxes for defects.

Now the other option is Dipper as in Pick Pocket !