Do you remember this
Locating broken links in a site. post and my answer
Locating broken links in a site.
Some typical examples of cites that changes content:
www dot sodora dot com
www dot kozoru dot com
redirecting to the first.
I think I have found more then 30 examples in the last months.
So may be we can share the following conclusion:
You have to manually check links on your pages if you want to be sure about OBL's.