I'm not so sure I agree with that.

I for one would not give my registration number or VIN to any Tom, Dick or Harry who just rang me up asking for it. If you did then what's to stop some tea leaf who's stolen a bike that matches yours using your reg and VIN? Any potential buyer would need to show some serious commitment first - i.e. turn up and actually look at the bike and show some interest - prove they're genuine and not a time-waster, or worse still a potential criminal. As it stands (at this stage) the prospective buyer (balzano_1) has nothing to lose, but the vendor has absolutely everything to lose!

Fair enough if he goes to see the bike and he doesn't want to reveal information/show documents, then walk away.

I think the seller's behaviour is perfectly normal and acceptable in this case. He is right to be cautious.

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