Several related posts that may be worth a look:
https://forum.inaturalist.org/t/old-observations-still-useful/20180
https://forum.inaturalist.org/t/should-i-post-old-observations-where-i-vaguely-know-the-location/25126
https://forum.inaturalist.org/t/adding-old-observations-from-other-sources-an-ideal-winter-activity/20527
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