Prettygirl1130, you've come to the right place for help. You can request more shipping materials. You'll need your submission ID and phone number you gave when you submitted your device trade-in request. The label should have came in your box with your new device. If your return-shipping label is nowhere to be found, you can print a new one from your order history within My Verizon.
Some helpful links: https://www.verizonwireless.com/support/trade-in-program-faqs/ under the section "What if I misplaced the shipping materials sent to me for trading in my device?"