Currency exchange at currency dealer

From: Lucas

Subject: Currency exchange at currency dealer

Message Body:

Hi I have heard long time ago that currency dealers will receive a code for their computers after the #800 appear which will change their rates on the computer.

I have some of my currencies at my currency dealer. And I have Zim and 3 notes (Vnd) with me.

Will the currency dealers receive their codes direct after the #800 appear or a later when the public goes to exchance?

Thank you for your help!