Identify ComBloc ammo in sealed tins

(I'm not sure where to put this post, but here looked as good as any place.)
I have several sealed tins of ComBloc Milsurp ammo & would like to know what is in them without opening them. My research only got me so far. I do know the ammo is corrosive. My research found contradictory information so I'm not sure what is what.

One tin is 7.62x25 (I believe). From what I can decipher it is brass cased, but also ranging/spotting(?) whatever that means, if it's even correct. I have no idea how many rounds are in the tin, when & where it was made.

The other tins are 7.62x54r. Pretty sure they're copper washed steel case, heavy ball ammo. Again, not sure of the quantity, when & where it was made.

Any help would be most appreciated.

Thanks jonnyc for the country of manufacture. I've figured out that the 7.62x25 can holds 800 rds, but still are not sure how many are in the x54R tin.

I know the Spam cans hold 400, but these cans are somewhat smaller.

Thanks much guys, your help is much appreciated. I thought the cans were a bit small for 440 rds, but 400 seems about right. Thanks for the bullets weights too.