My translation:

In regard to Mueller

Are you confused? Is everything alright? Do we have a problem?

Attempts to contact have failed. My (Our) attempts to contact Mueller have failed

Can you trust? Response start phrase

Your move. Message end

11-9bd-23 Sender verification code

Shall we play a game? All is well. Plan is proceeding as intended

Can you trust? Response start phrase

You know that we know. We know. We are aware

You know what we have. We have been able to contact

Your move. Message end

Noted:IP-Ghost: We confirm your identity via IP address