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Duplicate IP address are detected at the Ethernet level in the ARP protocol dissector (epan/dissectors/packet-arp.c):

    expert_add_info_format(pinfo, ti,
                           &ei_seq_arp_dup_ip,
                           "Duplicate IP address configured (%s)",
                           arpproaddr_to_str(pinfo->pool, (guint8*)&ip, 4, ETHERTYPE_IP));

You may not see any traffic at the IP level for these addresses.