True, there could be restricted shares that have matured. If 504 shares are being sold that would increase the O/S. I do think this is happening since the O/S is slowly creeping up.
There's really no way to know for sure, especially with pinks but it's better that the authorized is 100M and not higher (for now). My 'bet' is that the selling will end before the authorized is increased. With the upcoming events in the past PRs this could get more attention soon.