Very helpful. I was on my way of doing the same thing, but didn't see the needed container. If I were to try and get a unique list of all the values, does this make sense: 
my  $struct = {...};  # the hash of hashes in the question
my  $found;
Data::Walk::walk \&wanted, $struct;
print join(" ",sort keys %$found) ,"\n";

sub wanted{
   if (/^values$/){
      foreach ( keys %{$Data::Walk::container->{$_}} ){
         $found->{$_}=1;
      }
   }
}

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Demize

In reply to Re^2: How to find all occurrences of a key in a deeply nested structure? by deMize
in thread How to find all occurrences of a key in a deeply nested structure? by deMize

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