I am liking external inserts again. I use an ADA8000.
I have song where loading an external insert like in another song the output drive pair is missing. This means it's allocated elsewhere in the project. Fine, it's easy enough to down arrow through the tracks and buses while watching the outputs to find where it's being used but darned if I can find the missing pair.
 
Is there a better way to find allocated outputs?

If you are using the Console view those outputs should be in the bus section if they are being used. They also should show up in the output section whether being used or not. 

I'm using track view (old habits die hard).
I'll try that. Thank you.

They will show in the track view too. You just need to allow room for the buses at the bottom. You will need to create a template with them as buses, though.

A quick way to see whats is what is open the Track Manager, You'll find it in the track view task bar.