Aussie LP mortar carrier boxes

[Ryan]

I have just bought these on ebay. Picked up in inner city Melbourne of all places. The chap I bought them from got them from another chap whose father had served in WW2. He thought they were off the back of a tank. I think they are off a Bren carrier, and a Mortar carrier to boot. They are both angled in towards their front. I've included a picture of a Mortar carrier diagram. I think they are the outer rear storage boxes, the small ones. One looks to be fractionally bigger than the other. One features welded brackets inside it while the other is plain.
What do you guys think?