Folder Compare against AD Domain - powershell

Question

I'm trying to clean up our storage from legacy users that no longer exist and getting misc results.
I have a share with all usernames as folder names (ex. \\storage\homedir\joeblow) AD username: Joeblow. Throughout various years users have been removed from the domain but the folders were never removed from the share. So I am walking the share and using that to query the domain to find if said user still exists. I seems to work most the time and fail randomly. Not sure why, because manually sometimes the code will execute fine. Any thoughts?
Here is the code:
Import-Module ActiveDirectory
$folders = dir \\storage.domain.edu\C$\homedir3 | where {$_.PSIsContainer -eq $true}
$folder4 = "\\storage.domain.edu\C$\homedir4"
function New-Folder($Name, $Size) {
$folderList = New-Object PSObject
$folderList | Add-Member -MemberType NoteProperty -Name Name -Value $Name
$folderList | Add-Member -MemberType NoteProperty -Name Size -Value $Size
$folderList | Add-Member -MemberType NoteProperty -Name User -Value $User
}
foreach ($i in $folders) {
Write-Host "Folder presently is folder $i"
#$ADuser=Get-ADUser -Filter {$i.sAMAccountName.ToUpper() -eq"$i"} -SearchBase "OU=Active,OU=UserAccounts,DC=ad,DC=domain,DC=edu"
#$ADuser=Get-ADUser -Filter {samaccountname -eq $i} -SearchBase "OU=Active,OU=UserAccounts,DC=ad,DC=domain,DC=edu" -Property samaccountname
$r = "\\STORAGE.domain.EDU\HOMEDIR\$i"
$r = $r.ToUpper()
$ADuser = Get-ADUser -Filter {sameaccountname -eq $i} -SearchBase "OU=Active,OU=UserAccounts,DC=ad,DC=domain,DC=edu" -Property homeDirectory, samaccountname
if (!$ADuser) {
Write-Host "Null yo"
$ADuser = Get-ADUser -Filter {homeDirectory -eq $r} -SearchBase "OU=Active,OU=UserAccounts,DC=ad,DC=domain,DC=edu" -Property homeDirectory, samaccountname
}
$ADname = $ADuser.samaccountname.ToUpper()
$ADuser = $ADuser.homeDirectory
$ADuser = $ADuser.toupper()
Write-Host "R be this: $r and equal $ADuser"
#Write-Host "The person's folder name is: $ADuser"
#$iUp = $i.ToUpper()
Write-Host "The folder's is: $i"
if ($ADuser -eq $r) {
Write-Host "User: $ADname is in HomeDir3 $ADuser"
} else {
#(Test-Path "$folder4\$ADuser".trim()) {
#$notFound = $i
$folderList = New-Folder -Name $ADuser -User
Write-Host "$ADname failed"
}
}
#}
Write-Host "$folderList"
#$leftOvers = Compare-Object $folder4 $notFound
#Write-Host " Here is whats left $leftOvers"
#$i | Out-File -append "C:\deadaccounts.txt"