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Confirmation of the amount on hand from the custodian of the warehouse does not substitute for taking a physical inventory, because confirmation from the custodian does not prove that the inventory is physically present.
Regular physical inventory should be taken and the results compared with accounting inventory records.
Insurance can reimburse a business after a loss but it does not strengthen internal control over custody of inventory. Furthermore, if a business makes too many claims against its insurance, its insurance premiums may become prohibitively high or insurance may be unobtainable at any cost.
Reconciliation of transfer slips with inventory records is not the same as reconciliation of physical inventory with inventory records in the accounting system.