This script came in handy for various purposes! I used this in my RMM tool to report on how many and where PST files may be lying. This was helpful for machines that were re-used. You can narrow down the folder list using the path command.

gci -path c:\ -recurse -include *.pst -erroraction 'silentlycontinue'|select-object fullname,lastwritetime | fl fullname