I'm wanting to clean-up the media library, I have a script that outputs unused media library IDs. I then want to grab the media item associated with these IDs and download them to a temporary folder (ie SitecoreTempFolder). I've tried Send-File and Out-Download but these both store items to the local download folder which is not viable. 

I'm just after the actual media item/file and not the sitecore item. I have also attempted to use the move-item/copy-item but these cannot transfer between sitecore and local/temp folders.

Many thanks in advance for any advice!