Boys Rifle ammo bin info wanted

[Lynn Eades]

In Vol.1 of Nigel Watsons book, on page 81 there are two photos at the top of the page. Both photos shows a bin at the left up against the hull division plate. Each bin is different, but both are for ammo for the Boys rifle. (the one marked by the top wording after the title)
I am looking for what ever info I can get on either of them, Dimensions, photos, fixing hole dimensions, details of lids and catches etc.
Being able to buy one would help as well.
The photos of the stowage might help give some explanation and scale to those without the book.
The smaller Boys ammo bin in the right rear of the carrier (drawn over the boys rifle barrel) is also a mystery to me, as it is not drawn as a rectangle.
Any help will be appreciated.
Thankyou all.