If u r in USA, u get this kind of msg after approval
an approval notice was mailed. If 30 days have passed and you have not received this notice, you may wish to verify or update your address. To update your address, please speak to an Immigration Information Officer during business hours.
So, as u can understand, we can always call up customer care number and confirm our address and say that we didnt receive the approval letter.
I dont think u need the soft copy.