60 days or 90 days, it depends.
Yes you can return
From everything I've been reading about Costco 's return policy you should have no problems returning them. Even if you had opened them ate every last one, then went in with the open box and crumbs they would be more than happy to refund you on the purchase. Very liberal to the point of people taking advantage of their policy. Right down to the customer that bought a Christmas tree and returned it after Christmas because the needles are turning brown and dropping off.
Depends, but it is usually 30 to 60 days
Except certain items you can return at anytime.
There is a limited time policy for electronics. All other items are 100% satisfaction guaranteed. But I would not abuse this**
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