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If you want to visit the Arthur's Seat Coffins, and see them for yourself, they are on exhibition at the National Museum of Scotland. Address; Chambers St, Edinburgh EH1 1JF
In the early 1990s, Professor Samuel Menefee & Dr Allen Simpson investigated the remaining coffins and found that;
All of the figures seemed to be made by the same hand, although some of the coffins may have been made by two different people
Some of the materials used to make them included wood, iron, embellishments, nails, a sharp, hooked knife that suggested the coffins were made by a shoe maker
The eyes of the figures inside the coffins were open, making it unlikely they were designed to resemble coffins
The fabric the little bodies are dressed in dates back to the early 1930s, so they couldn't have been hidden in Arthur's Seat longer than six years.
For more information look at; https://www.nms.ac.uk/explore-our-collections/stories/scottish-history-and-archaeology/mystery-of-the-miniature-coffins/