We are customers here but what we can say is that you can use whatever boxes you have if you want as this link will help you to print the return label and return it via Royal Mail:
https://www.sky.com/help/articles/return-tv-broadband
Add a note inside with your account number and a list of equipment you’ve included.
Make sure you get and keep proof of posting when sending this off.
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If someone has helped you then please click on the LIKES button in their post.
If you need help please provide as much information as you can
