Replace your foreach loop with this instead -

foreach my $key (sort keys %images)
{
    my ($tapes, $img);
    my $client     = $images{$key}->{'client'};
    my $sched_type = $images{$key}->{'schedule_type'};
    my $sched_name = $images{$key}->{'sched_label'};
    my $policy     = $images{$key}->{'policy'};
    my $kb         = $images{$key}->{'kbytes'};

    # Create an array of tape records
    my @tapes;
    foreach (keys %{$images{$key}) {
        if (/copy_\d_frag_\d_id/) {
           push @tapes, $images{$key}{$_};
        }
    }

    # Join tape id's in sorted order
    $status{$client}{$policy}{'tapes'}
          = join " ", sort keys %{{map {$_=>1} @tapes}};
}
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