H4 Visa approval notice - address change


I got my H1 transfer approved recently. My wife’s H4 visa extension was filed along with my H1 transfer. My employer received my H1 approval, but H4 receipt notice was received at our home address with receipt number. Now the issue is: we are moving and H4 approval notice is not yet received. What will be date of expiry of H4? I got three years extension. Does my wife (she is in US now) need to get her stamping done again?



I am facing the same issue. Please advise me if you can.