I talked to a ISP worker last week who said she believes the firearm service bureau is behind about 90 days now. The worker doesn't work in the FSB herself. She had trouble getting her own husband's FOID renewed on time. She also acknowledged they don't answer the phones and knows its a joke (we all know this already).
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Have you tried calling ISP? I realize it's a bureaucracy with a lot of red tape down there... If that doesn't help, try contacting your State Representative to at least get someone down there to notice you.
When a FOID does get revoked, the ISP sends a letter to you and sends the same to your local LE agency. If CCSPD isn't your local LE agency, I wouldn't think they would be bothering you. I'd also be interested in seeing the video.