First, ufsrestore recovers files from a tape prviously written by ufsdump. It's a cool program, but it won't move stuff out of lost+found.

You can manually move things from lost+found by doing stuff like "mv /lost+found/143226 /etc/passwd" or whatever. But moving a file from one point to another point in the same filesystem never increases its size. If your disk is 16% full now, after the moves it will still be 16% full. If your disk was previously 63% full, then you are missing lots of stuff.

I never try to fix a filesystem that is this badly damaged. I would newfs it and completely reload from backup. Unless it is root, it which case I would reinstall the OS. Sorry for the bad news.

You would think that the superblock at least would be ok after a "fsck -y"; but I believe you, because the same thing happened to me a few weeks ago only on a SunOS 2.5.1 box. It may be that Sun's fsck is less than robust.