Can Find My Mac locate laptops that have been wiped?
If you use the Find My application to remote wipe your Mac you will no longer be able to track it.


  All content and settings will be erased when this Mac connects to the Internet.  An erased Mac cannot be located or tracked any longer.


For further details see the Apple Support document If your Mac is lost or stolen.

Bottom line...if your Mac is wiped, whether remote or done locally, it will no longer be tracked.  Most likely it’s been sold for parts if the security cannot be bypassed.