Closest to this happening to my guild was about 500k and lots of rare mats, and garden items like thavniarian onions and chocobo food were taken from the FC chest. I got pretty upset with the guild leader, especially after I told her she shouldn't be so trusting of the members who rarely log in. She agreed and demoted the culprit to the lowest rank. It took a while to replenish what was taken, but they could be replenished. Losing guild mates for whatever reason can be crushing. Strong FCs usually survive though, and shows a lot of character within it.
