Found this when trying to square my various ID stats not matching when looking at my Year in Review.
|ID Category||My 2020 IDs via inaturalist.org/identifications||My 2020 IDs via API GET /identifications|
Totalling up each of the four ID categories, you get 10,122 IDs - i.e. the sum of the obs in the pie charts.
But if you search IDs via the API without a category specified, there are 10,489 IDs, meaning there are 367 obs in that time period that do not have a category assigned.