Instead of doing an snmpwalk have you tried a get_request?

$response_href = $session->get_request( $sysContact, $sysDescr, $sysLo
+cation, $sysObjectID, $localDomain, $localHostname );
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You might also want to use Data::Dumper to output the results:

use Data::Dumper;
print Data::Dumper->Dump([$response_href],['response hash']);
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