Add another frustrated customer to the substantial list of people that loathe the fact you can't mark a refunded or cancelled order as fulfilled. I've read through a dozen such posts and there's always some discussion from the Shopify team as to why this isn't a current feature. It's clear your arguments and justifications aren't of interest or pertinent to your users. We don't want refunded items to show up in our unfulfilled queue. Plain and simple. Fix this.