I'm not sure if its an absolute requirement, but remember you are trying to make it appear as if you have moved to that state and made it your state of residenc

I'm not sure if its an absolute requirement, but remember you are trying to make it appear as if you have moved to that state and made it your state of residence. Not filing a change of address form looks strange without any other data in that context. If you want to avoid people knowing your address, I would recommend using a "private mailbox" (PMB) service and making that your official address. This gives you an address that is recognized as a physical address by most services and USPS but basically functions as a mail proxy: they will receive your packages / letters and forward them to another address you provide them. If you are concerned about stalkers or other hostile people, you could have the PMB forward mail and packages to a P.O. Box or commercial mail receiving agency (UPS Store et al) which is not where you live. Escapees and America's Mailbox are examples of PMBs with receiving facilities in South Dakota.