Didn't the mk2 fob set have a randomising feature to the codes? Not sure you'd be able to steal the code from a device like that as once it's been used it's gone.
That said if you gather enough of the code from the same thing you can work out a randomising key (ala-software code generation) but again not sure that would work.
Good man to your neighbour! All mine are elderly and probably wouldn't even see it lol.
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