Dōmo arigatō for the website SunshineSlayer!
Indeed, the first post has Google Earth links for the reseller shops, but they are only overviews of Shibuya and Ueno (they’re not pinpointing the shops).
Even so, I found on the website you provided the addresses for the three reseller shops of which it presents their offers.
Using these addresses and Google Maps, here are the precise locations of the reseller shops:
Shinjuku Reseller Shop Name of the reseller Yokohama Ticket Service - Shinjuku South Exit
(address: 東京都新宿区新宿4-2-9 < 4-2-9 Shinjuku, Shinjuku-ku, Tokyo>, Phone: 03-3357-5584, Fax: 03-3357-5629)
Ueno Reseller Shop Name of the reseller: Yokohama Ticket Service - Ueno Shop
(address:東京都台東区上野4-9-5早田ビル <SODA Building 4-9-5 Ueno, Taito-ku, Tokyo>, Phone: (+81)03-5817-3860、Fax (+81)03-5817-3861)
Shibuya Reseller Shop Name of the reseller: Yokohama Ticket Service Shibuya
(address: 東京都渋谷区宇田川町26-3 - < 26-3 Udagawa-cho, Shibuya-ku, Tokyo>, Phone: (+81)03-5459-2039、Fax: (+81)03-5459-2038)
This will help me, and hopefully other people, a lot.