not sure what you are doing wrong, your code looks ok at first glance … make sure you represent yes
and no
as string values …
if ( 'yes' == $provenance_mb->get_the_value( 'docposs' ) ) {
echo "If you wish to make";
} else if ( 'no' == $provenance_mb->get_the_value( 'docposs' ) ) {
echo "an apple pie from scratch,";
} else {
echo "you must first invent the universe";
}