Why doesn't my Powershell script work?

I have a Powershell script that seems to run ok, no errors and taxes the CPU, but does not do anything. The server will run this Monday Thru Friday at 7 pm.  The purpose of this is to find all pdf files that was created yesterday and move them to a new directory named by the LastWriteTime.Date.  When our ERP system does its end of the day, it generates all the assembly releases, in pdf format,  for the next day to be built. These are created in the directory named 'release_only'. We like to keep this directory clean so it doesn't get cluttered and eventually slow down another script that we run from the same location.

$src = '\\svr1\assembly_dept\schedule\release_only'

$dst = '\\svr1\assembly_dept\shedule\release_archive'

$file = Get-ChildItem -Path $src -Include '*.pdf' | Where{$_.LastWriteTime -eq (Get-Date).AddDays(-1)}

if ($file = (Get-ChildItem -Path $src -Include '*.pdf' | Where{$_.LastWriteTime -eq (Get-Date).AddDays(-1)}))
{
   $dstdir = $dst + '\' + $file.LastWriteTime.Date.ToString('yyyy') + '\' + $file.LastWriteTime.Date.ToString('MM - MMM') + '\' + $file.LastWriteTime.Date.ToString('MMM. dd')
 
   if(!(test-path $dstdir))
     {
      New-Item -ItemType Directory -Force -Path $dstdir
     }
   Move-Item -Path $src -Destination  $dstdir

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I could use a second set of eyes to help me figure this one out. Would really appreciate some help.