Possible Collusion on Party 5-10 6 Max

[stigmata]

Report it to Empire. Every post that I have seen that has sent a sensible email to Empire/Party (stating players involved, hand numbers etc), has recieved a full reply after a reasonable investigation. I know for certain that players have been barred and funds confiscated after these investigations.

It does look suspicous (but it could be totally innocent, as has been suggested), I think you should trust Empire and let them take it from here. They have access to the nessessary information to make a decision, and I do believe they take these things seriously.