I had a look at the RB_all_2020-01-02.gca atlas and there was no probabilistic information regarding the claustrum. However, in the mailing archive I have found the following: 

[…] Putamen should be smaller because we now try to remove claustrum."

Could you give a brief description of how you try to achieve it (if it is still the case)?

Thank you.

-Donatas