You can restore saved logs only if your Ubuntu installation as been upgraded from a previous version or if you (or the man who supported you) backed up your data in advance.
Reading your question I understand your helper put all your old data in a separate partition/position.
If so, first of all, ask him where he put your old data, and take a note: from now on I'll call this path <OLD-PARTITION>.
Then, note your user name: it is the name you can read in the top-right corner of your desktop in Ubuntu 11.04. I'll call this <your-new-username> from now on.
Same for your old user-name before upgrading (in case it was different): <your-old-username>.
Now, open Nautilus, the file browser. If you don't know how to do, just open a terminal and type nautilus <OLD-PARTITION>.
Now you shall browse till you reach the path below. Starting from the <OLD-PARTION> part, you only need to right click folders between "/" to reach it. If you cannot see the .local folder, press CTRL+H in Nautilus to show hidden files. Once you reach the "TpLogger" folder, right click on the "logs" folder and select Copy:
<OLD-PARTITION>/home/<your-old-username>/.local/share/TpLogger/logs
Then, do the same to restore, using following path. Once you reach the "TpLogger" folder, right click folder list and select Paste:
/home/<your-new-username>/.local/share/TpLogger/logs
After this, restart Empathy.