A 'kind-of' corrupted bzip2 archive

Hey, firstly, I'm a noob to Arch Linux, and heck, I'm pretty much a noob to linux as I started with Ubuntu just a month ago, anyway...
I backed up 4.7gigs of data with fwbackups to cross to Arch a few days ago, and didn't verify it (cos I didn't know about that), and now, it's corrupt somewhere. I've tried using bzip2recover, which has given me a lot of chunks of data (over 5000 blocks), but following the instructions here, I tested all the data, and the test results showed that there wasn't a single corrupt block...
Anyway, I put them all together following another tutorial here, and after trying to unzip the tar archive, it came up with another error.
So currently, I have an archive that is corrupt, but isn't corrupt. I have noticed two things though:
Firstly, a lot of the errors are saying that the file 'ends unexpectedly'.
Secondly, when I try to use head or tail to get a chunk of the big archive, I end up with an archive that is the EXACT SAME SIZE. This implies that head or tail has no effect on it (I tried head with -2000, or the first 2000 lines, and got an archive that's still 4.7 gigs).
I've currently got the latest version of bzip2 and tar.

With tail, I followed the instructions of the second website I mentioned in my first post, where I did something like:
tail -c +17185 before.tar > after.tar
and for the head, I followed the man page (I think), and just kind of did the opposite of the above, with:
head -c -2000 before.tar > after.tar
At least, I think I did that. I can't remember whether it was exactly like that, except I know that I almost certainly did the 'head -c -2000' bit.
With bzip2recover, it produced 5368 blocks, and after following the instructions of both websites (I had multiple attempts at this), I ended up not being to unzip anything. It produced an error every time. I even tried cpio, and that did 'file ends unexpectedly' as well.
I suspect either the archive actually does end abruptedly (maybe the backup process somehow stopped before the end?), or there is a bad header. Either way, my head and tail commands aren't working for me.

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