deleting layers issues

Hi

I can't delete some layers of an inhereted drawing with lots of layers and blocks.

When I select All entities, I get 141996 found , 2 not in drawing area (How can i find these 2 ?)

Then I freeze the layer to be deleted (which has nothing visible on it) and again I select All entities and I get 141983 found, 141983 total, 2 where not in drawing area, 13 were on a frozen layer.

How can I make these 13 entities visible?

Can I change the layers of entities of a block?

 

Thanks