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# After this line from snippet 1...
my %testHash = ( \@multiKey1 => \@stuff1, \@multiKey2 => \@stuff2, \@m
+ultiKey3 => \@stuff3);
...
                               ],
...
...

# Change this line from your first snippet...
# my %testHash = ( \@multiKey1 => \@stuff1, \@multiKey2 => \@stuff2, \
+@multiKey3 => \@stuff3);
...
print Dumper \%testHash;

# And run the code.

my %testHash = ( \@multiKey1,  \@stuff1, \@multiKey2, \@stuff2, \@mult
+iKey3, \@stuff3);

...
ARRAY: deref bla = 6 7 = ARRAY(0x98aa04)
ARRAY: deref bla = 4 5 = ARRAY(0x98a964)
ARRAY: deref bla = 1 2 3 = ARRAY(0x3e8d8c)