Dummy 50 cal round boxes

[Flying10uk]

I have these 2 empty boxes for "dummy/drill" 50 cal rounds which I purchased because they looked interesting some months back. I don't know anything more about them other than what is stated on the labels. I wondered if anyone knew anything else about them, please, such as their age and who may have been issued with them. Possibly they were steel dummy rounds because of the rust staining on the boxes? Thanks for any information.

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