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Kinda hilarious how this sockpuppet account just woke up from the dead and is now attacking the OP.
Who is behind these accounts attacking Cowboy310? I wonder.

.. If the originating wallet is linked to crime, they have every right to hold the funds under AML regulations
Got a proof OPs funds are linked to some crime? If not then I suggest you keep shut and not make baseless accusations. MrCryptoMixer is running an unregistered and what looks to be an illegal mixing operation. Since when did these shady mixers start caring about KYC/AML regulations?
Illegal or not, Cowboy310 has full right to get his funds back if they are with MrCryptoMixer.
At first I was thinking MrCryptoMixer isn't in the wrong here and OP was a victim of some sort of clipboard or DNS hijacking attack, but these attacks from sockpuppet accounts are making me think that maybe there's a possibility that MrCryptoMixer is trying to take advantage of Cowboy310's situation?
Can't say with certainty, and I don't think we will ever get to know what the truth is here.
In any case, Cowboy310, you aren't getting your funds back. Sorry for your loss.
Did you not see the "IF" his wallet is linked, hardly an accusation is it?
Yes MrCryptoMixer is running an illegal operation, and yes Mr 13BTC has every right to get his BTC back. If he goes via the police, they will 100% want to know where that money came from and why he is using such services.
If Mr 13BTC (noticed I used "IF" again) does not have have such documentation then he does not have any right to get his funds back, the police have every right to confiscate funds, and to charge both for money laundering and conspiracy for other crimes.
At first I also thought MrCryptoMixer wasn't in the wrong, and assumed it was a legitimate service that complies with local and international AML guidelines, but one look at the website clearly says otherwise, and not to be used or trusted. Had they been a legitimate business, they have every right to hold Mr 13BTC funds and ask for EDD, then file a SAR if necessary.
So, MrCryptoMixer is wrong and illegal. That's agreed upon?
Secondly, as I have said, one look at the website clearly shows they are not a safe or trusting place to deposit your funds, especially 13BTC, even at 2016 prices let alone current ATH's.
So any logical person would say, why on earth would someone use such a site if they were not a criminal, especially if the BTC was purchased through legitimate reasons as they claim.
Anyone with that kind of money is generally smarter than that, and would not use such services unless they were up to something, or its just a simple more money than sense situation.
Maybe a scammer encouraged them to use the site?
Unless MrCryptoMixer has suddenly become complaint and following regulations, its clear MrCryptoMixer has done off with Mr 13BTC funds, with no possible comebacks.
Mr 13BTC is still yet to explain why he used such a service, so I am still thinking the obvious