To determine whether Amazon products have appearance patents, you can follow the steps below:

1. Search patent databases: Visit patent databases such as the website of the United States Patent and Trademark Office (USPTO) or other similar international patent databases. For example, you can log in to www.uspto.gov.

2. Enter keyword search: Enter keywords for Amazon or specific products in the corresponding search bar to find relevant patent information.

3. Select filter conditions: If it is a design patent, set the filter condition to "Design" or "D". For other types of patents, you can select as needed.

4. Browse results: Browse the search results list and view patents related to Amazon and its products.

5. View patent details: Click on the patent link of interest to read the detailed patent description, drawings, claims, etc.

Please note that this process may be time-consuming and involve patent law terms and concepts. If you are not familiar with the patent search process, it is recommended to consult a professional intellectual property lawyer or expert who will be able to better guide you to obtain the information you need.