The Uncle Josh Bucktail Kit I have is much older than yours. Those are plastic jars of pork rind, and the buck tails are of a newer design from those used back in the day. The ones you posted resemble Spros. I still have containers of Uncle Josh Pork Rinds, but they are in glass containers, with metal screw caps. Basically they are glass jars of similar size to the newer plastic ones. The lids on mine show some signs of rust too.I never remember reading that Matt Ahern passed. I saw a few of his seminars. He was an excellent speaker. He borrowed the old Henry Ford comment regarding color: (paraphrasing) “Use any color bucktail you want, as long as its white”. I still have the Uncle Josh Bucktail Kit he recommended.
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If anyone has links to his writing, please post it.