The Pillar Box Trail

I don't know if many of you are aware of this set of boxes, but last week, I found number one on Pew Tor.
This has to be the oldest box I have ever found - and it was VERY well hidden. Lets put this in perspective:
It was placed in 1993, since then, only 12 people have found it - 4 of them being people I was boxing with. There was a period of around 10 years in between a couple of stamps.
Everything is intact in this box - it is dry, and still has the original handmade stamp which is a small pillar box with 'Pu Tor' written around it.
Has anyone found any other of the Pillar Boxes or even this one? I know Dizzy has been on Pew Tor, but not in this box!
(I can tell you the whereabouts of this box if you need it...though I'll have to wander back out with a compass...or something...)

Can you scan the stamp - I have a suspicion I know what it is - but then there were various pillar box stamps out on Pew Tor

I don't think i've found this one. Great find on your behalf though. Well done. It's great when you are the first in the book after many years.

I think I found this one last month ... is this it?

Did you see my stamp in the book? It was very well hidden. There were another four or five boxes within three paces of it too.

Saw you sly! That is the exact one. I got all the neighbouring boxes too - plus a lot more - great tor for it!
I'd really like to know if there are any others around, as I don't think I have a letterboxing book that goes back to 1993, if it is in a book.