How to find all duplicates

How do you find the location of all duplicates or replicants for that matter

That’s only possible via the “Instances” pop-up menu of the Info panel.

Thanks heaps. Exactly what I was after. It would be nice in a context sensitive menu, or something like that.

Not exactly what you’re asking but creating a “Duplicates” Smart Group can also be helpful for managing duplicates, e.g.:
Smart Group - Duplicates.png