Robert_Charlton - 6:58 am on Jul 4, 2013 (gmt 0)
What led you to the links in the first place? Webmaster Tools, or a backlink checker... or a combination?
Checking the archives shows that the domains had links to my site, but when I look at the current site, they are either 404s, down completely, or just blank.
By "archives", do you mean the Internet Archive/ Wayback Machine, or are you talking about something else?
The thought occurs that it's possible for links that don't show up on other sites, but which you think should be there, might be cloaked for Googlebot, in which case you'd need to use a User Agent Switcher plug-in to check for them. Since they're not on your site, you couldn't use Fetch as Googlebot.