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Your rewrite rules aren't showing up because you're calling it from functions.php before they've been defined on a global level. So, you can either hook into an action or pull the rules directly from the DB.
Doing it through a hook:
function check_my_rewrites() {
if ( is_admin() ) var_dump($wp_rewrite->wp_rewrite_rules());
}
add_action( 'init','...
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