To locate your secondary warehouse or fulfillment center in your Walmart Seller Account, follow these steps:

1. Log into your Walmart Seller Account.
2. Click on “Settings” and then select “Seller fulfillment”.
3. Ensure that “Fulfillment Centers” is selected.
4. On the page, you will find the details of your existing fulfillment centers.
5. Typically, the first one on the list will be your default or primary warehouse.
6. The second one on the list will be your secondary fulfillment center.

By following these steps, you will be able to identify and locate your secondary warehouse or fulfillment center in your Walmart Seller Account.