Isn't That A Joke From; "The Marvellous Mrs Maisel"?

https://www.jpost.com/breaking-news/article-807070

The very Israeli Moshe Maisel carrying a rotary cutter around with him everywhere he goes. So he can hide his money in the walls of other people's houses.

And as if to preove it's a World War Two thing rather than a Jew thing. 

How do you convert withdrawn banknotes back into legal tender?

Of course there is something about standing by a padlock with a slightly rusted woodchopper's axe in hand that makes you realise.

Padlocks aren't really locks.