Looks kinda like the clutch material off a band. From what you said WSTE and I were under the impression you pulled a transmission from a Comp G. If it wasn't a comp G, then all the better. We can stop worrying about that issue.
Based on that material in the filter, I wouldn't put that trans into a vehicle and expect it to work well or for long. Since it was in an accident you need to assume it was at least limping around. More to come once I pull the grains out of the beer boil pot and get it boiling.... please hold