ASA NodeID's not found

I have copied and modified the following SWQL from Thwack to do SerialNumber searches for our SmartNet guy, and it works great, except it is not finding any of our ASA's.

SELECT n.caption as Node, '/Orion/NetPerfMon/NodeDetails.aspx?NetObject=N%3a' + ToString(n.nodeid) AS [_LinkFor_Node], '/Orion/images/StatusIcons/Small-' + n.StatusLED AS [_IconFor_Node], h.ServiceTag, n.IPaddress, n.vendor, n.machinetype, h.model, n.location, n.customproperties.ZL_Location, n.contact, h.manufacturer

FROM Orion.HardwareHealth.HardwareInfo h

left join orion.nodes n on h.nodeid=n.nodeid

When I dug into this a bit more, i noticed that

SELECT ID, NodeID

FROM Orion.HardwareHealth.HardwareInfo

returned all NodeID's except for our ASA's. 

Where are the NodeID's and ServiceTags for ASA's stored?

thanks

larry