So, the encoded file has the exact same thing on the /bitcoinica_legacy/.git/logs/HEAD file
0000000000000000000000000000000000000000 939e877106a5bd479f350adc6d9e4170c62df8f3 genjix 1338505438 +0200 clone: from git@github.com:bitcoinica/bitcoinica_legacy.git
Cloned by Genjix from the bitcoinica private github repo on May 31 2012... Interesting

And look at who packed it... surprise surprise
drwxr-xr-x genjix/genjix 0 2012-07-07 20:18 bitcoinica_legacy/
That's not the encoded file. You're still looking at genjix's re-pack.
[...]
After, I opened the bit.tar.bz2 file with Ubuntu file manager and navigated to /bitcoinica_legacy/.git/logs/ and opened the HEAD file with gedit.
Try it yourself.
You're right, my mistake.
This line is in the original encoded file.
0000000000000000000000000000000000000000 939e877106a5bd479f350adc6d9e4170c62df8f3 genjix 1338505438 +0200 clone: from git@github.com:bitcoinica/bitcoinica_legacy.git
This shows that somebody accessed genjix's copy of the bitcoinica source code (maybe it was on that VPS which also had the SSH key which was re-used on the consultancy's e-mail server for the prior breach).
But how did you get this to claim that he packed it:
drwxr-xr-x genjix/genjix 0 2012-07-07 20:18 bitcoinica_legacy/
You are implying that genjix intentionally leaked the code. I can't confirm that.