That sort of smuggling would normally depend on small high-value items. Not bloody huge ones.
And in general, unless the money is dirty, there should be no particular problem transferring money from Germany to Israel.
In contrast, everybody knows what a gold bullion is.
Passenger: I want to declare this painting.
Customs agent #1: That's revolting. It can't possibly be worth anything. Have a good day.
Customs agent #2: That's revolting. It must be valuable, otherwise nobody would keep it. Pay up!
(Note I don't actually know if the painting is revolting, I only saw a tiny thumbnail of it, and I do like modern art).
That sort of smuggling would normally depend on small high-value items. Not bloody huge ones.
And in general, unless the money is dirty, there should be no particular problem transferring money from Germany to Israel.