Hi,
Well, though the Save Selected operation by default shouldn't save also the Camera, I would suggest you to use slightly different work-flow - to Merge / XRef Merge wanted objects into a newly created scene.
This way you can easily double check that you are merging all Forest object components just by selecting desired Forest object(s). By having Display Influences option selected in the Merge window you'll have better control over objects needed to rebuild the Forest object.
Hope that helps.
Best regards,