You use your GPC to purchase a case of envelopes from a merchant. When you get back to the office you realize that the envelope size will not meet the requirement so you return the item to the merchan?

Well, honey, sounds like you need to pay more attention to the details next time. Returning the envelopes is the right move, but maybe next time double-check the size before swiping that GPC. It's all about reading the fine print, darling.