Hammer history question

[Petr Janda]

So I accidently deleted one of my worksheets. How do I find out modification 
history of the file and the necessary transaction id?

Ive look at "hammer history" but it doesnt seem to show me anything but the 
last modification

petr at elevator:/home/petr/docs/callstream_files/2009# hammer history 
report4.ods
report4.ods     0000000829bb8510 clean {
    000000086128f420 13-Nov-2008 17:57:06
}

even though I modified the file at least 5 times this week and hammer cleanup 
hasnt been run since last sunday.

What to do?

Petr