We traded up a '68 Arrow Glass boat and can't get the title fixed in our names because we can't find the serial number. They told us where to find it and it is not there. Either the plate is gone or that is the wrong place. We have sanded the extra paint off and still can't find it. We read that there is often a 'secret' HIN number hidden on the boat, does anyone know where to locate that one, or where the original one might be elsewhere? We have looked all over the back of the transom where we were told it should be. Thanks.