My brother in law has an older double door Herring file safe out in his garage that he's had for several years. Today I was out looking at it to see if I could get the combo reset for him. I noticed it had an aluminum box aprox.10 in long x1 1/4 wide x1 1/2 deep with a glass vial aprox 7 in long inside, mounted directly behind the wheel pack. Whats in the vial ? It's 3/4 full of a clear liquid that dosn't freeze. Is it tear gas? I removed it from the safe as he only wants to use the safe for fire protection and not security. Any one have any ideas? thanks, Mark