I still submit that no justice, no matter how much I may despise their politics, did this. I think they all understand the consequences of this regarding the integrity of the SC and the long term damage.
From what I read, the liberal justices have a total of 16 clerks. Unless you suspect that a clerk for one of the conservative justices did this as some kind of SC conservative PSYOP, those 16, along with from what I understand, a small and less likely handful of admin assistants, are your potential culprits.