You can get a list of species observed in a place that you have not recorded records of. Using the unobserved_by_user_id paramenter.
With one caveat, it only works for things you have not seen anywhere, not in the chosen place.
Thus a list like the URL below is all birds reported in Ontario that I have never reported, not that I have never reported in Ontario.
Thus for example a species like Grey Kingbird which I have observed, but not in Ontario, will not be in this list. There is no way to do ‘things I have never seen in this place’ unless of course you do a full report on all species and export it to excel or something
You need to know the taxa number and place number but they are easy to find. The hrank and lrank are not absolutely needed, but keeps things like genus and family from being in the results.
There is no way to reverse the sort so it shows the least frequently observed.
And yes, it is much better to use the iNat Standard Places