I have done same thing while shifting from Dishtv to Airtel.
I purchased new box of Airtel and not sold the Dishtv box.
Still i am having that Dishtv Sd box for any kind of future usage if required.
@bharathnat kindly do not post your mobile number or any other personal/sensitive info on any public forums. You can pm or email the member if interested. Your mobile number has been removed and i have sent it as pm to Dr.siva