So it's because the states allow votes with a postmark of election day, even if it takes 2 months to arrive? How do you know every vote is counted without a cu

So it's because the states allow votes with a postmark of election day, even if it takes 2 months to arrive? How do you know every vote is counted without a cut off period defined? It can take years to deliver some mail: https://www.itv.com/news/anglia/2020-05-29/soldier-s-letter-home-to-suffolk-finally-delivered-80-years-after-he-died-near-dunkirk https://www.itv.com/news/anglia/2020-05-29/soldier-s-letter-... If the margin is less than the number of unreturned postal votes, surely there will be a question which can never be answered.