Make use of collections(M) and name everything(F2). If you’re majorly into organizing things and always name your objects you can quickly identify duplicates by the period and 3 numbers at the end. This will make it easy to search and filter in the outliner. for example: click the funnel icon and at the bottom uncheck object content(This removes data names from your search. Then in the search you can just type period and 0.(.0) If you want to get fancy you can use ranges by placing square brackets. For example say you only use period and 2 numbers instead of the 3 numbers that blender uses. You can ignore those by typing “.00[0-9]” (Without the quotes). You could replace the 2 zeros with [0-9] if you think you would have more than 9 duplicates of the same object.(.[0-9][0-9][0-9]). Hope that helps
You may want to look into the collections manager addon. It’s under extensions now. for older versions of blender it comes with the download.
***Edit*** Change it from 4 to 3. Blender adds 3 numbers not 4.
