Recently I put my own house under contract. I took photos with the equipment (on the main floor) and wrote on the listing that all AV equipment is excluded from the sale and that the walls will be restored to their original condition. In the basement, I did not do photos of HT on purpose since all of that isn't staying, and I did not want to draw attention to that and avoid displaying the excessive equipment. I had zero issues with the buyers on the subject; everything was clear from my listing.
As a suggestion, get an IP Camera that records 24/7 and install to cover your equipment. Advise the agent to have the buyers sign the appropriate form (consent to video/audio recording).