Question on search function returning no hits

Hi, using the search function to look for '145106a6724146b886fdc41c229d7a3c'. The usenet search return nothing - but it does exist - should return 118 parts from the group alt.binaries.multimedia.
I'm not using any poster or spam filtering
Can you explain this?
Thanks
I'm not using any poster or spam filtering
Can you explain this?
Thanks