If you find that an accessory is missing when you buy an Amazon product, you can take the following steps to deal with it:

Check the order: First, confirm whether the accessory should indeed be included in your order. Check the order details to confirm whether the accessory is listed in the order.

Contact Amazon Customer Service: If you confirm that the accessory should be included in the order but did not actually receive it, you can contact Amazon's customer service department. Log in to your Amazon account, find the relevant order, and select the option to contact customer service. Explain the situation to customer service and provide the order number and accessory details.

Provide evidence: When communicating with customer service, provide relevant evidence to support your claim. For example, provide screenshots of the order, screenshots of the product page, or other relevant information to prove that the accessory should be included in the order.

Solution: Amazon customer service will provide a solution based on your situation. Possible solutions include resending the accessory, refunding, or other compensation measures.

Please note that the specific handling method may vary by region and specific situation. It is recommended that you contact Amazon customer service as soon as possible so that they can handle your problem and provide a solution in a timely manner.