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Well put

A responsible owner would record their serial numbers (no need to pass them onto the police if you don't want to)

Then, when they get nicked you can tell the police exactly what's missing. Unless...

"Eeerrrrm sarge there's a few bangsticks in here"

Nah the handful of cops I know are a wee bit more savvy than that.

Hope they get proper time.

Is .455 a relatively uncommon calibre in nz? You'd think a search on the police computer with something like that would bang out some quick results...