Liner for Tuffy Lockbox

Has anyone found a good material to line the Tuffy Lockboxes with?
I've seen the picture of the one with the waffle non-skid material.

I was wondering if any lined theirs with closed cell foam? or Neoprene rubber?

How thick did you go if you did line with the foam?

Thanks!

Someone posted here their carpeted box. Think it was automotive carpet. But anything would work. An easy n cheap , if color is not important, could non-skid shelf liner on the bottom. But for the sides I think carpets' stiffness would reduce need for a lot of sticky to hold it on.
I haven't gotten around to it in mine yet. I put the extra lug nuts in a baggy. That eliminated the my problem. But I still want to do more whenever I get around to it.

They sell toolbox liners at lowes in the truck box section...