Costco shipped the wrong item (an upgrade)
It is like Costco can read my mind, I was thinking of returning the item and wait till an upgraded model to be on sale because when the upgrade model is on sale (previously, not currently on sale) it cost the same or lower as the non-upgraded version's regular price (which I ordered). The item I got is exactly the item I was thinking to upgrade to.
In this case, would I be liable to keep what shipped to me? (Pretending it's on sale, just for me) Or I need to report to them?
Update: I called Costco, I got to keep the item and there's no warranty issue.