This piece of glass that you describe is almost certainly an infrared filter. Camera sensors are sensitive to infrared light as well as visible light. So camera manufacturers fit filters over the sensor to minimise the amount of infrared entering the sensor and achieve a good colour image. Security cameras have to work in low light at night when infrared lamps are used to provide illumination that is not visible to human eyes. These security cameras have a mechanism that moves the IR filter in front of the sensor during the day but away during the night.I have this apart. The rectangular glass on this camera is attached to the sensor. No glass except the lens in the black plastic lens holder.View attachment 116347View attachment 116348
With a slight bit of pressure, I popped it off the sensor.
And yes there is a frame made out of some material around this glass, but I don’t think it’s paper. Possibly a foam or very soft rubber material.
Certainly needs to be handled with care and not get anything on it. At the right angle, still attached to the sensor, it’s red, but removed and lookin straight through it, looks clear.
If I could find information on that lens I could sell it. Otherwise I don’t know what to tell people it is, for certain. Thanks for the helpI have worked on cameras with the red lens. They are expensive and used for crop health as you say. I would sell it if I were you. Someone will want it