Packaging things that aren't there

When I hit package and view the output log there is A LOT of stuff that is not used. Not in a map, not referenced, not even a file for it.
a good example is the Kite demo. I wanted to use a couple things from it and added it to the project. Took out the few materials. And deleted it in the editor (then went and found the folder and deleted it too since it leaves stuff behind.

Yet it goes through this really long list of looking from things like kitedemo/boulder.assu can’t find it after looking forever and returns NULL
is there a quick way to fix these?