Since, as others have pointed out, calling a method on a blessed reference stored inside a compartment will look for the appropriate package only inside the compartment, you will have to take your reference and manually rebless it.

my $datacopy = $MySafe::data;
bless $datacopy->{person}, 'Person';
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Now you can call Person's methods on $datacopy->{person}. You can actually rebless the reference with its own binding: bless $datacopy->{person}, ref $datacopy->{person}; This will work, even though the package name referred to inside the compartment before, so long as $datacopy is inside an unrestricted package, not in MySafe. You could automate the process with a a loop like ref($_) and bless($_, ref $_) for values %$datacopy; Ultimately I'd return an anonymous hash from inside the configuration data:

$string = <<'EOM';
{
    'person' => bless( [
        42
    ], 'Person' )
};
EOM

my $data = Safe->new()->reval($string);

ref($_) and bless($_, ref $_) for values %$data;
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Makeshifts last the longest.