I take it the contents of the package are up in smoke?
Actually, they're down in drops, but the effect is much the same.
Haven't really seen enough for sale on original packaging to get a sense of price, might try selling some that way.
There are a couple of whole cardboard packages listed on eBay
right now for CDN$28 each. Not sure if there will be any takers at that price.
I would leave it whole. Fiscal history like postal history leans toward "full documents" being worth more than clippings, being worth more than soaked-off stamps.
I think I'm going to take John's advice and keep it whole. Will have to see if I can figure out how to protect it in storage.