this has never been proven on this board. The only debenture proven is the one stated in a PR that have a 3 year restriction on them.
The fact that you choose not to look for it does not mean that it doesn't exist. It was either Straty, Beachlifeguy, or maybe Naturalborninvestor who brought it up here.
I don't have search as I'm not a paying member so it makes it much harder for me to find the exact message. But...It's there.
I'm sure that's not going to be good enough, but I really don't care. The people here who have some real time on these boards should know about their existence.