Google will continue to return the old site for a while. Search is much better on the new forum, so please try your searches here first. However, if you do use Google and it takes you to the old site, the fix is generally to update the URL by replacing the letters "vb" that appear immediately after "usa7s.net/" with "ips" That should take you to the correct post in the new forum.
Using our most popular thread as an example, google would return the first url and you would want to edit it to the second url
https://usa7s.net/vb/topic/9351-ebay-and-craigslist-ads-lots-of-sevens-for-sale
https://usa7s.net/ips/topic/9351-ebay-and-craigslist-ads-lots-of-sevens-for-sale
-John