I don't think its a bad idea to be cautious. I also witness the fire and it was bloody dramatic.
The LIPO bag, at best, lasted 5 seconds which was long enough for somebody brave to grab it and throw it. The rate at which LIPOs burn is pretty scary and there is little benefit in a fire extinguisher/sand bucket to hand since the damage will be done in the first few seconds.
I don't exactly know why the LIPo on friday caught fire but my understanding was that it puffed up during charging so was disconnected and placed in a safe bag to cool. 30 seconds later big flames.
I suppose the safest storage solution is to store them in the pouch and then place that in a metal box. There is a clip on youtube about somebody testing an old cash box:
http://m.youtube.com/watch?v=6M5ftkN9PtY