Identificaciones de ipat

there shouldn't be any cowries here....

yet here is a cowrie shell, found somehow attached to a piece of seaweed on the beach, as if it washed up on shore.
the first pic is in situ.
it wasn't hard to remove the cowrie from the seaweed, but a little piece of seaweed remained stuck to it.

where could it have come from? jewelry or a souvenir? why was it attached to seaweed then?

• 38 mm long