Multiple Collisions Within Different Objects

Hi guys. I need some help. =D

I'm instantiating several objects at once in different positions in the world. Each object has its own box collider (some have a sphere collider). It is uncommon, but can happen, to 2 objects been instantiated within their collisions. How can I know that?

Lets suppose that I instantiate 10 objects and 6 of them are within their colliders. How can I know that?

Thank you very much!