Original 8mm ammo can early variation typically for Maxim 08 and 08/15 though used with MG34 and MG42 machine guns. These are identifiable by pre-WW2 pattern toggle latch and handle. They are also slightly heavier than the later Patronenkasten 34.
These are ideal for repainting in German colors.
RAL 7021 is the grey
Y5233-A is the tan (Dupont Centari)