Two wall switches appear orphaned... What to do?
I would caution to not remove anything you do not know what it controls.
House fans are common, an exhaust fan in the attic?
I caution that trying to make resistance measurements is normally a waste of time and I have seen a lot of ruined meters when DIY folks and apprentices have measured live circuits.
Why are resistance measurements questionable?
A thermally switched attic fan will show open in the cool winter being 1 switch and the light fixture for that fan that the light burned open.
I was called in to repair some wiring in an exactly similar case.
The owner found the dead light and fan later and wanted them to work, 4 or 5 total trips into the attic to identify the feeder and verify the removed switch’s  then to reconnect and verify took over 2 hours to get repaired and working. The owner then remembered removing the switches.
I had an emergency call a sump pump quit working and the finished basement was flooding, when you are looking for a failure not a switch the owner took out in the summer it takes longer and emergencies on a weekend night cost 2-3x if you can get someone! The owner had tested the circuit and it was open the sump was empty and the float switch opened the circuit.
So there are 3 different cases a burned out lamp, a thermal switch and a float switch that made the circuits look like nothing was there.
You mentioned putting in receptacles, this may be a possibility depending on how things are wired. Do not assume that white is a neutral in switch box especially if it connects to a switch in this case it is normally a hot and even though code recently changed requiring neutrals at most switches reality is most homes will have old style switch loops for decades to come.