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Alistair Tyrrell

In article ,
says...

I'd be wary of any 4 digit code...

We had an aged relative who was admitted to hospital. When a little
better he wanted some stuff, but lost his keys on admission...
We assumed warden or neighbour would have spare key. They didn't...

I got the 4 digit code at second try. I wonder how many other dwellings
in the same complex had identical or very similar codes? So the last 4
digits of his land line would probably have been more secure.

Apparently many people have set a code of a memorable year
such as DoB or marriage. So a high percentage of all
keysafes have the first two digits set to 19 meaning the
thief only has to twiddle wheels 3 and 4.