I have photos of 10-20 miniature headstones, as used on common graves, now laid flat alongside the mound and around trunks of trees in squares 8, 16 & 24 and which may have come from the mounded area. I won't have time to look up where each of them came from this side of Christmas, but I can check the surnames if anyone cares to ask. Sorry, no Wells there.
The office (at Camberwell New Cemetery) might have photos of the original area and any headstones that were removed. They photographed those from squares 100-108 (mainly) alongside Underhill Road which have just been relandscaped for reuse. They published a list of plot numbers and names (which I have) and would even let you take away your ancestors' headstone
