I do not have the access to customer episerver UI but the DB in read only mode.
Does anyone have a SQL script or StoreProd for getting the shippment Form and its line items based on a cart id?
What do you want to do with them? What data are you interested in getting? You can always use a tool like Sql Server Management Studio to browse your database tables.
Exec ecf_Load_ShoppingCart_OrderGroupId @OrderGroupId = @cartId should work for you.
However using SP directly is not something we recommend.