Resurrecting this because I too found a Bic recently.

I was out walking the dog this AM and as we were crossing a frost covered grass field, I saw a yellow Bic lighter lying in the grass -- yellow is very visible. It was covered in frost and obviously had been out since yesterday. I cleaned off the frost & grass clinging to it and dropped it in my pocket.

Once it warmed up to ambient in the house I gave it a try and it fired up on the first attempt. Short term freezing and frost seems to have had no impact at all. Still half full of butane too.

Not exactly a valuable find, but free is great when it works.