There are so many ways of hiding the destination of the scammers coins that it is virtually impossible to trace it. A lot of sites on the internet will allow you to register without KYC/AML requirements and you can push those coins through these services. They also allow you to change the sender address, to withdraw from their services and some even mix your coins.

A lot of these sites goes down and then resurface under a new domain, so you cannot trace any logs, because they are destroyed or not even logged by these sites. A lot of people open multiple accounts, which makes this even more difficult to follow.