Some say the Iron dust stuff is toxic and must not be consumed. This is the stuff you find in food packets like beef jerky. Though, some references say it is OK in small doses other say it isn't.
I'd wondered what the stuff was in my beef jerky packets so I searched the web only to have conflicting results. I would probably keep the beer as long as I was able to retrieve the packet. It will settle to the bottom anyway.
It might have been a moisture absorber it's hard to tell it was completely clear and honestly looked like a mini bubble wrap. So I have no idea what it was and hope my beer is okay I would be pissed, really pissed if I did 6 hours of brewing to lose my batch. I will ask my Homebrew shop what it was
It had at most 3 minutes of contact time and was on the bottom of my brewing vessel on top of my false bottom. But I don't think it held enough chemicals to screw a batch of beer. I would be open to anyone's opinions.
It was not a packet but a thin clear piece of plastic that looked like it had little bubbles like bubble wrap.