The number of potential objects thus found 'in harms way' is 2573. I haven't seen any answers, yet, and I don't know either. Nobody is buying that one anymore.
Workable analogy is a operational olympic size swimming pool to represent orbital space.
A grain of fine desert sand for the total size of all man made objects. Crush the grain to dust and scatter it within the pool. For all intents and purposes, you, a spacecraft, will not 'find' any part of it. For now that is. Then there's that pesky collision possiblity.