haha, by his attitude, I'm assuming that people have abuse this policy before. I'm thinking if you return the empty bottle, they'll still take it, albeit a bit gruntled.

Mine was about 2/3 gone. Definitely beyond of the point of "hm..this wine taste funny"

Over the years I've had so many little moments like this with Costco, whether it is a friendly exchange with a gas station attendee, a door person stopping me and pointing out that I was over-charged, a service rep who couldn't find an off-brand pedialyte I purchased so they gave me a pedialyte and told me "eh yeah just don't tell anyone", it really started to make sense to me why when you mention Costco - some people would light up and say "man I LOVE Costco", when it's just a store.