spam monitoring

Hi

Exhange 2013

Two roles CAS and MB on a single server.

AntiSpam transport agents is enabled.

I am trying to trace the letters that transport agents filtered as spam.

Get-AgentLog-StartDate14/07/2014|Where-Object{$_.action -ne "AcceptMessage"}

Filtered three letters

and

Get-ChildItem-Path"C:\Program Files\Microsoft\Exchange Server\V15\TransportRoles\Logs\FrontEnd\ProtocolLog\SmtpReceive"|Where-Object{$_.lastwritetime -gt "07/14/2014"}| Select-String"Default\Frontend\serverName.+5\d\d\s5.\d.\d"

More than fifty errors, respectively, the same filtered letters 

Why result of the two scripts are out of sync?