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My third time was the charm.
https://farm2.staticflickr.com/1758/40866855460_9e9c68ce54_c.jpg
Rockfall Shelter by Jared Payne, on Flickr
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A gap enough for my camera to fire blindly within only revealed a view of it from a limited angle, couldn't see all surfaces a panel could be on, hence wasn't able to confirm.

I looked for it last year. I believe I located the shelter due to the fact it had been blocked off, which prevented me from confirming however. Was probably done due to severely heavy vandalism. ...