repquota question

*** Report for user quotas on device /dev/hda2

Block grace time: 7days; Inode grace time: 7days

Block limits File limits

User used soft hard grace used soft hard grace

----------------------------------------------------------------------

root -- 5944 0 0 274 0 0

ziox -- 16376 20000 25000 1119 0 0

admin -- 5944 0 0 274 0 0

sales -- 60 0 0 15 0 0

analyzer +- 19512 15000 20000 4days 564 0 0

#375 -- 244 0 0 16 0 0

#1000 -- 5116 0 0 556 0 0


--whos those users #1000 & #375 I did't find them listed any
--where /etc/passwd,group ? So i couldn't delete them...