In case you need ammo boxes, I have bought several used (with patina!) ammo boxes from the army surplus store, 274 high st, Charminster, Bournemouth BH8 9RT tel 07885759491. I paid £10 - £20 each for them depending on level of patina. Perfectly serviceable, made to look a lot better with a quick rub down with wire wool followed by a coat of Klearcote spray from a rattle can.
Simon