Many thanks for the responses.
If I am interpreting the ic-racer's photo correctly, the four screws seem to hold the entire front lens board assembly onto the rear part of the lens board and the bellows. I was hoping that the raised area around the screws came off by itself, and let the rear lens element drop out. Not the case, however. See my photo from the inside of camera with the film pack removed, below. Under the circumstances I think I will just live with a few small fungus spots. I have not noticed any effect on the photos, anyway.
So far I've not found any free pack film Polaroids, but I suppose there are folks out there that just want to get rid of them. The local Craigslist currently has a 100 for $40 and a 360 for $100 asking price.
rear lens 300dpi.jpg