Can't find my Bukkit .jar file?

Hi there,

I'm trying to find my bukkit .jar file so I can upgrade (or I guess downgrade) to 818 from 889, but I can't seem to find it in my directory. What folder could it be in/what would it be named?

Thanks,
Josh

PS: Not sure if this would help, but here's a screenshot of my current directory (using FileZilla FTP):


PSS: When I type /version into my server, it says:

"This server is running Craftbukkit version git-Bukkit-0.0.0-889
-g22f4388-b928jnks (MC: 1.6.6)
This server is also sporting some funky dev build of Bukkit!"

^ If possible, I would like to remove that funky dev build as well, but I can't seem to be able to find it.

 

It should be in the very first folder, under the name: craftbukkit-0.0.1-SNAPSHOT

 

The "404" folder? That's a map.

 

Sorry, didn't realize what I was looking at.
This is the folder that the .jar should be in, however.
What is in the 'update' folder?

 

It seems to be empty. Could it be possible that there's no .jar in the directory? That wouldn't really make sense, though, since the server is running fine with Bukkit plugins.

(Just a note, I didn't originally install Bukkit on this directory, I'm trying to fix up a friend's server.)