9998 is a postalcode and its consensus geometry is derived from oa.
{"mz:is_ceased":0,"geom:latitude":53.383382,"wof:name":"9998","counts:names_total":0,"wof:placetype":"postalcode","mz:is_current":-1,"mz:is_approximate":1,"wof:hierarchy":[{"continent_id":102191581,"country_id":85633337,"localadmin_id":404474561,"locality_id":1158796637,"postalcode_id":538958723,"region_id":85687059}],"mz:is_deprecated":0,"geom:area":0.00102,"geom:longitude":6.622961,"wof:id":538958723,"counts:concordances_total":1,"geom:type":"Polygon","wof:lastmodified":1513382103,"clustr:alpha":1,"wof:belongsto":[85687059,102191581,404474561,85633337,1158796637],"mz:is_clustr":1,"wof:concordances":{"gp:id":"12853889"},"wof:repo":"whosonfirst-data-postalcode-nl","src:geom":"oa","wof:country":"NL","counts:names_preferred":0,"gp:parent_id":"12592143","geom:area_square_m":7523227.037963,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"NL","counts:names_languages":0,"geom:bbox":"6.58876609802,53.3682441711,6.65546560287,53.3970985413","wof:superseded_by":[],"wof:supersedes":[],"wof:geomhash":"3e4fb96030c294cbff3f64b610e2ccb7","wof:parent_id":1158796637,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu"}