Last week, PH Cobbler posted to the forums stating that there are some account tags that are not available to members through normal account use and that these would be added in the next patch. The patch will be Tuesday, 25 January.
Until the patch, if you have one of these agent offers, you may query and a friendly member of Polaris will give you the tag. Please query only if you have one of these account offers. After the patch, it will be neccessary to get the tags through normal means of account use.