I have a few here to look at, that 100% came over with the shipment from Ireland. There seems to be 3 types.
1. ZB made half box that contains 6 mags
2. ZB made full 12 mag box
3. Post war made britisth 12 mag boxes, bronze green colour, standard makings on the front.
Makers marks. LSL/57 on the front of the box. PMD 1955 BE6094 on the lid with large
broad arrow. These are the most common makers.
No other special markings, they are off the shelf so to speak,except you can find some
marked up to platoons/companies.
There is another possability which is british WW2 made boxes which went over with the early MK1 ENFIELD BRENS, but i have seen a lot of tins from this Irish batch and there does not seem to be any that have turned up in any number. Well done SKIPRAT they are a bit rare those 6 mag half boxes.