TIS/BG is at 15 Frederick St. You can get the cabinet locations from the cabinet details Excel spreadsheet on the Chorus website (google e.g. cabinet tis/bg location). The locations are NZMG coordinates. You can use an online converter to convert them to NZDG latitude and longitude and then search for that in Google maps.
The VDSL card is installed in the cabinet. The exchange only supports VDSL in a small area around its location at 587 Mount Albert Road.