...
      my $pass = 0;
      while (<FILE>) {
         $pass |= 1 if ( /\bPASS\b/ );
         $pass |= 2 if ( /\bsweep\b/ );
         $pass |= 4 if ( /\bFinal\b/ );
         if ( $pass == 7 ) {
            push @keepers, $file;
            last;
         }
      }
 ...