First of all, the returned hash is empty so it's no wonder that you the uninitialzed warning. I've never used Net::SNMP but from a quick glance at the docs I see:
$result = $session->get_request(
[-callback => sub {},] # non-bloc
+king
[-delay => $seconds,] # non-bloc
+king
[-contextengineid => $engine_id,] # v3
[-contextname => $name,] # v3
-varbindlist => \@oids,
);
so I think you're call of request is wrong and should read
$result = $session->get_request( -varbindlist => [$OID] );
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