HOW WOULD THEY KNOW? If you ship in or out there are few records kept as to how long you were ,in or out.
Anyway it is not going to happen, there is an orchestrated campaign of idiocy and uselessness that is guaranteed the there will another vote and it will be skued as to how the answers are put so as it will be a STAY IN result. IT has been deemed to be so, by those that really have the power in the world. Mark my words, it will come to pass.