I think the sticking point with the insurance co. will be how you will prove how much propane you had intially. They would be thinking you are trying to fabricate some tall tale to get a free load of propane out of them. But I do agree that it should be covered like any other claim - fire, flood, etc. Your load of propane was a "posession" just like a sewage-soaked sofa.
Squirrels are destructive little f'kers, and once they have "moved in", they are impossible to keep out. My father had a family of squirrels living underneath the eaves of the house. They had chewed in under the raingutter fascia boards. New fascia installed - chewed through it. New fascia and alumium flashing overlay - chewed through it. New fascia and new pellet rifle - no more problems.
I recall him telling me he greased almost a dozen of them before the "problem" was solved.
I used to squirrel hunt when I was a kid. Fried squirrel and fried morel mushrooms....mmmmmm. Tastes like chicken.
Coalkirk, if that squirrel is still alive after his 'gassing', he may want to get back in there, and that fine wire mesh will be like so much Chef Boyardee spaqhetti to him. Keep a real close eye on it.