If the coins moved you can bet they would move to a mixer. Whether it's MCM stealing them, a hacker stealing them, or the OP playing games - in all of these scenarios it the perp must obfuscate them so any tracking would not be successful. Come to think of it, the "OP playing games" scenario probably has the least incentive for the coins to be moved. If someone stole them there is no reason to wait.

The only other scenario that I can think of is that the OP sent coins to an address no one has private keys for. This would also explain why the coins haven't moved. It's not easy to do accidentally though. A simple typo would result in an valid address.

Anything else we can read from this fact?