I am able to get all of the hardware serial and alias information, but how do you specifically get the chassis itself?
See this LabVIEW example using the same API and convert it to LabWindows/CVI functions.
Programmatically Read the Serial Number of a PXIe Chassishttps://forums.ni.com/t5/Example-Programs/Programmatically-Read-the-Serial-Number-of-a-PXIe-Chassis/...
LabVIEW VIs used are the following, you should be able to find the C API equivalents by searching NI System Configuration API Help.
(Property Node) System Filter: Is Chassis
(Property Node) System Hardware: Serial Number
Here are the links I found on the property nodes:
Property Node (Filter) Descriptionshttp://zone.ni.com/reference/en-XX/help/373107E-01/nisyscfg/property_node_filter/
Property Node (Hardware) Descriptionshttp://zone.ni.com/reference/en-XX/help/373107E-01/nisyscfg/property_node_hardware/