Good pictures, verifying that the rounds are dummies.
I think I have some similar dummies in early US Auto pistol
calibers, that is, looking like a loaded round except for one
or more small holes in the case. They are often tinned, also.
Early on, at least in the 20th Century, American dummy rounds
were with tinned case, and high-pressure proof loads were
with blackened cartridge cases. (Some dummies didn’t have
the tinning - probably depended on customer’s order and the
quantity made). Late on, they reversed that ID, with dummies
in blackened cases and proof loads in tinned ones, the latter often
with a red bullet, red bullet tip (looking almost like tracers) or a combination
of red bullet and all red case-head.