Is it permissible to mediate the sale of an electric bicycle obtained by a relative from his friend, who reported it stolen to the insurance company to receive compensation?

There is no objection to buying this bicycle or mediating its sale, as long as it has been sold through a legitimate transaction and is not stolen or usurped. The sin of the owner claiming it was stolen to receive compensation falls solely upon him and does not affect the ruling on the bicycle for whoever bought it or mediated its sale.