Powershell excel replace always returns true - powershell

Question

I've doing a find and replace in a whole bunch of excel files (to update some links that have moved)
I want to track which files had changes made to them however the result of a replace is always true regardless of if the required text was is there. A find like this:
$worksheet.UsedRange.Find($Text)
will either return null if the text being looked for does not exist or an object if it does, but thats significant extra processing I'd prefer to remove given that I have about 1.2million files to check.
Here is my replace code:
$found=$false
$xlCalculationManual = -4135
$excel = New-Object -comobject Excel.Application
$excel.visible = $false
$excel.AskToUpdateLinks = $false
$excel.DisplayAlerts = $false
$excel.EnableEvents = $false
$workbook=$excel.Workbooks.Open($openfile,0,$false,5,"nopassword","nopassowrd")
$excel.Calculation = $xlCalculationManual
foreach ($worksheet in $workbook.Sheets)
{
foreach ($Text in $FindText)
{
If ($worksheet.UsedRange.replace($Text,$ReplaceText))
{
$found=$true
}
}
}

Answer 1

Looks like Theo is correct on this. I've not found anyway to increase the efficiency by removing the find.
Also it seems that on some files a replace only replaces the first instance and therefore a loop is also required.

Answer 2

Maybe try
$worksheet.UsedRange.replace($Text,$ReplaceText)
If ($?)
Instead of
If ($worksheet.UsedRange.replace($Text,$ReplaceText))
OR you could try searching for the text, and confirm that it found something?
Before your if replace option, try (I apologize, but this code is speculation, and may not full fix it. There is an article on this at https://msdn.microsoft.com/en-us/vba/excel-vba/articles/range-find-method-excel
$confirm = $worksheet.Used.Range.find($text)
if ($confirm -ne $null) {
Echo $true
$worksheet.UsedRange.replace($Text,$ReplaceText)
$confirm = $null
}
else{
echo $false
}