XF 1.3 User showing as "guest"

[nodle]

I have a user that shows as a "guest" he is not associated with any group. He was leftover from a import from IPB way back in the day. He later joined under a different name. All his post show but there is no account associated with him such as a user, banned, etc. He is just a "guest". Is there any way to associate this with an account so I can have control to say merge it with his other account etc.? Or has anyone else run into this problem and were able to resolve it? Thanks for the help.

 

[AndyB]

I would like to go through and reassign many of those guest posts to current members (when I can ID who is who).

You can use this add-on:

https://xenforo.com/community/resources/change-author.2832/

 

[Movie Prop Sites]

@AndyB, that is SUPER slick! The only issue I am seeing is that I have thousands and thousands of posts like this and was hoping for something that could go through and pull all the guest posts with the same name and reassign them to an existing user as opposed to doing it one post at a time. Do you have any suggestions for that?