for this, you could use some variant of this to get this sort of information: https://jumear.github.io/stirfry/iNatAPIv1_identifications_recent_taxa?per_page=100&place_id=14&taxon_id=47170&verifiable=true&hrank=species
it should find cases of the first identification of a taxon for the given parameters (or at least the first identification in a while). it’s nice because you can see these by order of latest novel identification (regardless of whether the identification is on an old or new observation). so i find it can be useful as sort of a news feed.
here’s some of the original discussion about it: https://forum.inaturalist.org/t/how-to-find-out-of-range-observations-wiki/4271/2.