But how did they end up in France?
And thanks to a local farmer, they finally got their answer.
Morvan recalled seeing the phones in the 1980s not long after a storm swept the area.
Photo:Claire Simonin/Ar Viltansou
You had to really know the area well, Morvanshared.
We found a container aground in a fissure.
Many of the things were gone, but there was a stock of phones.
Photo:Martin Dominique/Ar Viltansou
Eventually, they were able to locate it, but it was empty.
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The pieces come from a shipping container hidden in a cliffside cave.
The shipping container was lost during a storm over 30 years ago.
Photo:Claire Simonin/Ar Viltansou