Router Return Help?

Hi

I just Got a Mailer from Verizon to Renew my Contract for two more years.
and to Renew Online after I Did the Online Renewal. Verizon Sends me a New Router

My Questions are

Do I send Them The Old Router?
If I Do How? a Return Label Came in the Box with the new Router but I Think its for the New Router Only and Not the Old One.

Thanks
Sweet Lou