False allegations hurt everyone. Massive amounts of time are wasted and the community learns to ignore these kinds of complaints as a result of the boy who cried wolf syndrome (is that a thing?).
There are only two logical steps forward here.
1) Have the original PM authenticated.
or
2) Lock this thread.
However, thule has tried to get these authenticated by theymos and another mod so it is quite apparent that he believes these are real. That rules out the speculation thule is sending these non existent messages to himself. That makes zero sense.
If suchmoons dox has been done before then it could be the correct details for the address in full. If it is then he could have found it on the dox or they were scammed by suchmoon.
Sometimes investigations can take some time. I would expect from the dates one could look at Suchmoons post history from that era to see if there was discussion and interest in such miners.
Really Theymos or mod should investigate because if someone would steal a miner like that and then gloat it is quite disgraceful. Also it would just clear this matter up so we can just know the truth.