Reel McKoi wrote:

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The place we ate had the original snail still in the shell. We had to
pick them out ourselves. If there were bugs we would have seen them.
What did they reuse the shells for? What were they putting in the shell
after the original snail was removed?

Most, but not all places (in France, UK and Belgium), serve snails in
shells giving the impression that it is the snail's original shell. The
costs involved in providing the original shell with the snail would more
than likely be prohibitive.

Around 20 years or so ago, you used to see snails sold in the
Supermarkets (I guess there weren't too many sales as it is now only
specialist delis that sell them). The snails were canned/jarred and the
shells came wrapped in selophane and stuck to the top of the container.
The tins/jars of snails were also available for sales sans shells...

Gill