Matt:

Its been years since I got my criminal justice degree but IIRC those other items can be held as supporting evidence to show that a criminal intent or "guilty mind" existed.
The example I was once given was that if three people were pulled over in a car while wearing ski masks and carrying guns, the ski masks could be held as evidence of a conspiracy to commit a crime. IOW, the cops seized everything they felt was relevant or possibly relevant to a crime. Chances are that these other items will be returned.

Chris