Of course, we can't rule out the possibility that someone created their own chips, but my guess is the older keys weren't compromised.
When was the bc1 key transition announced?
To be clear, you suggest that the LE did not move funds on addresses starting with "1" but only in "bc1". What about addresses starting with "3", did chip mixer ever had these?
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I'll also state what i said in another thread:
Fact is: chipmixer lied in it's claims to delete private keys.
I don't know how can anyone defend them after it was made clear by users. I suspect it's about the signature campaign, so ukhm.. corruption or Stockholm syndrome?
Therefore it is justified to assume that chip mixer ran from the very beginning as
private honeypot for the owner and gathered all kinds of information.
Based on what was stated by LE - what kind of high-profile actors moved money through chipmixer, I don't think the vietnamese guy will be ever found alive, best case for him is to surrender to LE
Other people and some eastern 3 letter agencies might be looking for him to find out what the truth was. Not only law enforcement.
He not only f*** himself but also other people. Fortunately in many countries using such obfuscation services or receiving funds from them is not making you guilty of anything.
If the @Chipmixer guy had at least some honor, he'd post here what was stored so it's clear for all the people using his toy.
The fact that he's hiding, does not mean he has no access to the internet or that he is not watching our posts.
PS. 7TB can be either nodes, backups, or the forensics image of the whole drive/s including free space.