Garagekeepers Symbol 30 Requires Employee Payment for Services

We have a client that owns a restaurant with valet parking service. He wants to insure his responsibility for the automobiles in his care, custody, and control. I suggest a garagekeepers coverage, but symbol 30 implies that customers have to pay for the service in order to provide coverage. My suggestion is to amend that requirement, but insurer requested symbol 29, which is for liability coverage. Do you have any comment that would help us to clarify this situation.

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