If the data partition just has been wiped (formatted), you *may* find data in the raw dump of the data partition. How did you do the "raw copy" of the internal storage?
However if you already have a bit-level dump of the partition you could try to grep for your bitcoin addresses (the addresses are also stored in the data file). The data file where the keys are stored in begins with:
so you may look for these strings too.
Good look! And print your backup next time, it's really easy with Mycelium.

I created the "raw copy" using the method described at
http://forum.xda-developers.com/showthread.php?t=1818321 under the headline "Back up of the whole memory block (via adb)". So I seem to have backed up all the partitions and not just the data partition (but it should be in there too).
I grep'd for the and found two newer wallet files that were created when I tried to reinstall Mycelium but I could not find the one that has my bitcoins so I guess it must have gotten overwritten at some point, right?
Thanks for the help!
