Quite right, sir.  The dbatools.io script is dandy, but doesn't address the OP's question.  It looks like the script posted by the OP and tweaked by Jack 95169 will do...

I know this an older thread, but in case anyone's still looking, Chrissy and Friends over at dbatools.io have it covered: https://docs.dbatools.io/#Get-DbaDbDetachedFileInfo