I've accidentally deleted a crate that i need. Its not in recycle bin. Where is it? Or is it lost?

Also, anyone notice that if you have crates within a crate, the the top crate has random tracks in it eg: I've got an opening genres crate - basically a few smart crates with rules - genre and rating Pop - Opening, R&B Opening etc. They are put in a to top crate called 'Openers'.
However randomly in that top crate are tracks which aren't even assigned to the smart crates; peak time tracks for example.