Since the document has been deleted I don't know of a way to see the original creator (as Transfer Orders dont have an archive). Maybe you have another environment or copy of that company where the document still exists.
For future reference, documents will have two fields that tell you the Created at date and Created by user. You can inspect the page on the transfer order (Alt + Ctrl + F1) and then see who created it and when:
And if you want you can also add the "Created At" and "Created By" fields to pages in BC by customizing a profile. You just need to navigate to the Profiles (Roles) page and then Customize pages and add those fields to the pages you want to see those fields on.
