Originally Posted by
DaveReidUK
There's a link to a clearer version of the photo in my post #14.
I can't see any holes that look like a screw head has pulled through them.
The photo I showed is from the one you linked to. I just rotated it to its upright position and cropped it to view that top edge.
To compare hole sizes, notice how much foliage and brick shows through that top left hole. It looks wide enough to pass the head of a screw - at least given one that had been partially loosened with vibration and allow to bend slightly.