Hi dingas60
If they boxes are rentals, you can drop them off at any of our retail locations. You can find a list of locations here: Shaw Retail Locations. If this isn't possible, then I'd recommend connecting with our support team who can arrange to have a tech pick them up, or can send you a shipping label to mail them back.
If you own the boxes, then it's up to you - you can sell them or give them to someone you know who has Shaw, or you can drop them off to be recycled if you have an electronics recycling depot near you.