Were they sweets?
Yes. The coffins contained candy jigsaw pieces that you could fit together to make a skeleton. Well, most of a skeleton; you usually needed more than one coffin to get the bits for a whole skeleton.
Bone shakers.
Thanks. Vaguest of memories. I've got a feeling kid me didn't realise they could be assembled and just thought they were odd shapes.
Fffuuuuu......
https://www.ebay.co.uk/sch/i.html?_nkw=Rare+Bone+Shaker+Skeleton+Candy+Coffin+Container&mkevt=1&mkcid=1&mkrid=710-53481-19255-0&campid=5338792814&toolid=10001
@itsbruce started
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Were they sweets?