You might find it simpler to process a single directory at a time. For example

#!/usr/bin/perl
use strict;
use File::Find::Rule;
use IO::Uncompress::Bunzip2;
use Time::Piece;
use Time::Seconds 'ONE_DAY';
#use Data::Dump 'pp';

# build regex
use Net::Netmask;
my $ip = '72.46.130.0/24';
my $block = new Net::Netmask($ip);
my $re = join '|', map { quotemeta } $block->enumerate();
#print $re;

my $FMT       = '%Y-%m-%d';
my $dateStart = '2017-12-01';
my $numberOfDays = 5;

# array ref for dates
my $dates = get_dates($dateStart,$numberOfDays);

# Directories to search 
my @LogDir = qw(
  /cygdrive/c/Users/anon/Documents/logs/png1/
  /cygdrive/c/Users/anon/Documents/logs/png2/
);

for my $path (@LogDir){
  for my $ymd (@$dates){
    my $dir = $path.$ymd;
    next unless (-d $dir);
    print "In directory '$dir'\n";
    my @files = File::Find::Rule->file()
      ->name( '*.bz2','*.log' )
      ->maxdepth(3)
      ->in($dir); 
    for my $filename (@files){
      searchForIP($filename,$re);
    }
  }
}

sub searchForIP {
   my ($filename,$re) = @_;
   print "--- Searching  '$filename' ---\n";
   
   my $fh;
   if ($filename =~ /bz2$/){
     $fh = IO::Uncompress::Bunzip2->new($filename)
     or die "bunzip2 $filename: $IO::Uncompress::Bunzip2::Bunzip2Error
+";
   } else {
     open $fh,'<',$filename or die "Could not open $filename : $!";
   }

   my $count = 0;
   while (<$fh>){
     print "$filename:$.:$_" if /$re/;
     ++$count;
   } 
   print "\n$count lines scanned\n";
}


sub get_dates {
  my ($start,$days) = @_;
  my @dates;
  my $t = Time::Piece->strptime($start,$FMT);
  for (1..$days){
    push @dates,$t->ymd;
    $t += ONE_DAY;
  }
  return \@dates;
}
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