[Possibly controversial opinion:] If the seller has been on eBay for a while (is an established seller, lots of feedback, high feedback number, lots of items for sale, etc.) then it's reasonably safe to send a return without tracking - they understand that shipping costs are high and are just trying to either (a) help you out by saving you money on return shipping if you're the one paying for it; or (b) trying to reduce their loss on the return if they're the ones reimbursing you for the return shipping.
As long as the address on the untracked item is correct, and it has enough postage, it should get back to the seller just fine (don't forget to include your return address!). And an honest seller will just process the return once they get it and send you you're refund.
Just make sure that you are aware of the potential risks associated with it. Without tracking, there is no proof that the return was sent back, so if the seller is dishonest they could just lie, saying they never received it, and you will never get a refund. There's also a chance that the untracked item could go missing while in transit (unlikely, but a small percentage of mail does go missing for various reasons unfortunately), and without tracking you're out of luck as Canada Post will have no way to investigate and try and find it.
If the item in question is of higher value (what constitutes "higher value" is up to you) then it's probably best to send it back with tracking just so you're 100% sure the item won't go missing and you'll get a full refund. Just note that if you're the one paying for the return shipping, you're probably looking at a minimum of $20 to ship it back through Canada Post (depending on the size/weight/distance of travel, of course).
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