Funny you say that, I am pretty sure I saw at least one of them in the battery area. The way it was crammed in there it almost looked like someone had put it there on purpose to keep the battery from moving. It may still be floating around somewhere, I was going to look for it again.
And I didn't think of the pool noodle but was going to look at work tomorrow in some of our packing crates. Some of them have some heavy duty versions of that same stuff in them. I figured the same as you, it'll do until it squishes down, then I'll just replace it with another piece. That's the airhead way, right??