Endpoint /admin/orders.json?customer_id=X returns no orders by Denny Swindle

I'm helping a client debug an issue.  When we pull a customer profile using the API, we get the following back: http://cl.ly/image/2W3r101U3C2i

But when calling the /admin/orders.json?customer_id= endpoint, it returns no orders: http://cl.ly/image/0o06362G132H As you can see in the first image (cutomer profile), the profile says there should be 14 orders.

Please advise.

Thanks