if you find nothing in Utlities-> change log then change the start date to date more in the past until you you get some hits, then use Ctrl+F to search within the hits. Add the flag for include tables changes and try again.
Try the same in your production server, the transported change will as well write a change log and you can see in the details the number of the TR. You can then go back to development and lookup the user in this TR