If you want to know it your locks are using the extender you'll need a Z-wave tool of some sort. You can buy Z-Wave tool box or make one via this thread. These device let you trace the packets and "see" what is talking to what.
The bigger question is do the locks work after adding them?
I use a couple community apps to get my locks to work more reliably. If yours continue to misbehave, I'm happy to share the recipe (it's posted one a few lock threads all ready)
