I picked these up last year.
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Hi Matt, welcome to BOCN and I don't mind at all!
From your location, I assume Rob A? I know another Rob with two 6 pdrs too, must be something about Roberts!
I don't know a source of the boxes, Australia seems to be the best place to look. I understand a friend is looking into having them made in the UK, though I don't know how far that has progressed.
I restored Robs latest 6 pdr! I'm much the same though, I try to collect all the accessories for my guns too.