SZ FIPS 10-4 Switzerland ISO 3166 Swaziland

From annawiki

version2.dk

While there are thousands of kilometres between their physical location they are somewhat closer linguistically.
'On the face of it it simply seems like one of the writers of the report did a typing error,' he says.

heise.de

Besonders krass waren drei Adressen aus der Schweiz, die im Bericht in Swasiland verortet wurden. 
Hier habe es außer der sprachlichen Ähnlichkeit zwischen Switzerland und Swaziland nichts gegeben, das nach Afrika gedeutet hätte, so Version 2.

anna.info

Another possible source for error in the opinion of anna.info : The US FIPS 10-4 country code for Switzerland is SZ and may have been used for encoding while SZ in ISO 3166 means Swaziland and may have been used for decoding. Even though FIPS 10-4 had been withdrawn 2008, nga.mil as of 2017-01-01 states "The GNS will continue to use geopolitical codes based on GEC (formerly FIPS PUB 10-4) for the foreseeable future." http://geonames.nga.mil/gns/html/countrycodes.html