grep -l 002389983 * | xargs grep -l 29994339499

##</code><code>##

open my $fh, "<", $File::Find::name or die;
my ($f1, $f2);
while (<$fh>) {
    $f1 ||= /02389983/;
    $f2 ||= /29994339499/;
    last if $f1 && $f2;
}
if ($f1 && $f2) {
    ... Both patterns found ...
}