I've been to the Paris a few times over the past 10 years or so. AFAIK, the darker blue (RHC) with larger inlay hasn't been used since before I started going, I don't recall ever seeing any darker blue $1s in circulation there -- all the $1 chips have been light blue. The light blue THC is the one that is currently used, and is (or at least in recent times was) now much easier to harvest since the 2022 WSOP, as Paris added poker rooms and made a lot of $1s for use at poker tables.
Before that, there was no poker room, so the $1s didn't exist in large quantities, and basically had to be harvested a few at a time from at table games or from the cage, but it wasn't easy to do.