Missing library objects from Embedded Library

[alesim]

Hello, everyone.
I have some problems with some missing objects from the embedded library of a Teamwork project. I have tried using the search filter in the 3d window displaying all the elements but I cannot find a single one. I searched for objects that contained the name of the library object. How can I locate these objects and delete them permanently?
Thank you from the outset for your help.

Alessandro