A chap I used to know got hold of some of those infamous " Council Keys " at one time. He let himself into a multi-story tower block, went right up to the roof and started messing around with the communications equipment installed up there. He had some sort of grievance with the law so he decided to disconnect their radio battery backup system and throw everything 220ft off the top of the roof ! did time for it I believe.Easily available, our Council has these for facilities which a number of people need to access.
This company offers just about any type of "alike" keyed padlocks.
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Damn nuisance those keys haven't seen them for years, all electronic push button locks these days.