PowerShell - Office 365 mailbox - get emails from custom folder

I need to get all emails from office 365 account, not from Inbox but from specific folder "Processed"

$mail="automate@company.com"
$password="pass"

# Set the path to your copy of EWS Managed API 
$dllpath = "C:\Program Files\Microsoft\Exchange\Web Services\2.0\Microsoft.Exchange.WebServices.dll" 
# Load the Assemply 
[void][Reflection.Assembly]::LoadFile($dllpath) 

# Create a new Exchange service object 
$service = new-object Microsoft.Exchange.WebServices.Data.ExchangeService 

#These are your O365 credentials
$Service.Credentials = New-Object Microsoft.Exchange.WebServices.Data.WebCredentials($mail,$password)

# this TestUrlCallback is purely a security check
$TestUrlCallback = {
    param ([string] $url)
    if ($url -eq "https://autodiscover-s.outlook.com/autodiscover/autodiscover.xml") {$true} else {$false}
}
# Autodiscover using the mail address set above
$service.AutodiscoverUrl($mail,$TestUrlCallback)

# create Property Set to include body and header of email
$PropertySet = New-Object Microsoft.Exchange.WebServices.Data.PropertySet([Microsoft.Exchange.WebServices.Data.BasePropertySet]::FirstClassProperties)

# set email body to text
$PropertySet.RequestedBodyType = [Microsoft.Exchange.WebServices.Data.BodyType]::Text;

# Set how many emails we want to read at a time
$numOfEmailsToRead = 100

# Index to keep track of where we are up to. Set to 0 initially. 
$index = 0 

# Do/while loop for paging through the folder 
do 
{ 
    # Set what we want to retrieve from the folder. This will grab the first $pagesize emails
    $view = New-Object Microsoft.Exchange.WebServices.Data.ItemView($numOfEmailsToRead,$index) 
    # Retrieve the data from the folder 
   # $findResults = $service.FindItems([Microsoft.Exchange.WebServices.Data.WellKnownFolderName]::Processed,$view) 

   $findResults = new-object Microsoft.Exchange.WebServices.Data.SearchFilter+IsEqualTo([Microsoft.Exchange.WebServices.Data.FolderSchema]::DisplayName,"Processed")
}

But $findResults variable is empty, although there are emails in that folder, is there any way to get emails from specific folder in Office 365 ?