They are not military surplus.
Advantages of an Ammo Box, Instead of the packaging
ציוד צבאי עודף - פשוט לקנות בזיפי
VINTAGE MILITARY ARMY Ammo Box Burrowes US cal. 50 M2 original paint (empty) $15.00 - PicClick
Impact Resistant Ammo Boxes For Storage
Pelican TX50 Adventure Case - Black
BLACK HIGH GLOSS Army Spray Paint Cans 400ml US Military Spec Paint Industrial £13.00 - PicClick UK
MTM Case-Gard AMMO CAN ORGANIZER POLYMER BLACK - Brownells UK
5.56×45mm NATO - Wikipedia
Ammo Box for sale