In your log line sample there are two lines with the same first number. however if the first number is the log line and you use a sample where all the first numbers are different this shows you how to create a hash of arrays where the key is the first number in the line.

#!/usr/bin/perl
use strict;
my @sample = 
("483 OS dx-32 1 charles list4 aardvark.com ty-off lx-on C 01",
"495 DS dx-14 1 james list3 23.456.12.7 ty-on lx-on B 01",
"769 XO dx-32 5 sully nolist widgets.com ty-on lx-on V 07");
my %hoa;

foreach my $line (@sample){
  my @array = split(/ /, $line);
  my $key = $array[0];
    $hoa{$key} = \@array; #this is a reference
  }
my @keys = keys %hoa;
foreach my $item(@keys){
   print "log line $item\n";
   my @array = @{$hoa{$item}}; #this is dereferenced
   foreach my $part(@array){ print "$part - ";}
   print "\n";
}
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This will not work if you eliminate the my designation for @array.