I upgraded and old UBB 5.44b forum through, UBB Classic as and interim step, then to UBB Threads 7.4.2

We allowed unregistered users to post a while back on 5.44b until the spam got too bad. The unregistered users showed up with a name. Here is an example thread before:
http://j30.us/ubb/Forum6/HTML/000034.html

and the same thread after:
http://j30.us/ubbthreads/ubbthreads.php/topics/189/1.html

Note that some of the posts show as anonymous that previously had names. How can I restore the names to these posts?