Seach for folder on multiple computers powershell.

I have the following powershell...

Get-ChildItem -path "C:\Test\Hub" -filter "initiated.txt" -recurse | Select-Object CreationTime, LastWriteTime, @{Name="Result";Expression={($_.Directory -Replace ([regex]::Escape("C:\Test\Hub"),""))}}, @{Name="RunTime";Expression={"{0:N0}" -f ($_.LastWriteTime - $_.CreationTime).TotalSeconds}}| Where-Object {$_.RunTime -gt 0}  | Sort-Object "CreationTime"

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And need to do three things, I would ideally like to do this in the one statement as I want to pipe the output of the command to a graph generator cmdlet - but I will take what I can get!...

1) For each 'Result' value found (will be a folder name) I want to search 4 remote machine paths ('MAC1','MAC2','MAC3','MAC4') to see if the folder exists on these machines - it will exist on one of them and return the appropriate machine name to the piped output of the cmdlet.

2) The 'RunTime' is being output I guess as a formatted number i.e. 20,000. I would like to have this as a straight integer with no comma delimeter. I have tried...

@{Name="RunTime";Expression={"{0:N0}" -f [integer]::($_.LastWriteTime - $_.CreationTime).TotalSeconds}}

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to no avail.

3) At the moment the code searches for 'initiated.txt' files, but I can see the requirements changing to include files of type '*.alo'. Is there a way I can add this as a search option in the statement and populate a new column with something like ALO/TXT to differentiate? This is the least important option at the moment.

Any help greatly appreciated.