Unless the FBI was able to catch the messages on the fly, it is incredibly unlikely that anything would be left on the disk or in RAM. Even if there was something, it would just point back to a previous Mixmaster node. Because Mixmaster is high latency / store and forward, it has much better security characteristics than a real time / low latency system like TOR.
I spent a lot of time on the design to protect against this kind of thing.
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Unless the FBI was able to catch the messages on the fly, it is incredibly unlikely that anything would be left on the disk or in RAM. Even if there was something, it would just point back to a previous Mixmaster node. Because Mixmaster is high latency / store and forward, it has much better security characteristics than a real time / low latency system like TOR. I spent a lot of time on the design to protect against this kind of thing.