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If you have devices that are not returning the SNMP Location, then it would be best to setup a Custom Property for location, site, build, etc. to highlight that detail. Once you have the details in place adjust your ajax to use the Custom Property that was setup instead of the SNMP Location.
If you look at your node details under the location and contact and find those populated they should be available for use in the Ajax. If they are blank, then you would need to login to the device and see if you have the option to set the SNMP Location so you can get that detail for the AJAX to use instead of having it show unknown.
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