22 long Rifle 100 rd CIL military box


Santa brought me a CIL 100 rd military box. Similar to Dunn CIL-2 LR-9 (d)with these differences: No T. P. printed or stamped under top Logo between SMOKELESS and GREASED. Both sides have what looks like handstamped broad arrow inside a large C, C.I.A.A. on a second line beneath this May 23 1940. Know the broad arrow is Canadian government property mark. What is the significance of the CIAA?