Read the notice:
"UNDER EXECUTIVE ORDER OF THE PRESIDENT"
"all persons are required to deliver..."
But it was effectively voluntary.
I remember my grandmother showing me what “real money” looked like - a small jar of gold coins. Other old folks also had gold coins. They had been in circulation so it was no big deal to keep them, the ones confiscated were those that passed through the banks. No cops knocked on doors and searched for hidden gold.
It might be different today with the modern paper trail.
It was people who volunteered to bring it in, and not have their homes ransacked...however, nothing like ‘ransacking’ even occurred...