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When a DHCP server receives a DHCPREQUEST message, it processes it as specified in [RFC2131] section 4.3.2. As specified there, the presence of a "server identifier" option indicates a new lease acquisition, and the absence of one indicates a lease renewal.
The NAP-SoH (section 2.2.1.1) option and NAP-CoID (section 2.2.1.3) option are extracted from the DHCPREQUEST message packet by calling DhcpExtractVendorSpecificOption ([MS-DHCPE] section 3.1.7.2).