You can use filter_input to sanitize your $_POST array.
$nonce = filter_input( INPUT_POST, 'revv_meta_box_nonce', FILTER_SANITIZE_STRING )
use empty() to check $nonce has a value or not.
You can use the same for second issue
$foo = filter_input( INPUT_POST, 'foo', FILTER_SANITIZE_STRING )
change 3rd parameter based on your expected data in $_POST['foo']. check this doc for available filters.
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