Simple enough to make sure things like bankbooks aren't left lying around for police to find. I doubt very much if it's in the police's role to be confiscating bankbooks and advising banks to freeze accounts.
Thanks. I asked on the Pattaya forum because it's from here I would be making my way to the embassy. If I was in Hua Hin I would have asked on that forum.
How would the police know, by checking every bank in Thailand? I very much doubt if police check every deceased persons account to see whether it's a joint account and freeze it if it is. Makes no sense.