How to recover deleted files from a shared volume?

Setup - Mac Mini Server (OSX 10.8.4, Server 2.2.1(169)), 256GB Flash drive, System data only. External 8TB G-Raid holds all business data, backed up to a LaCie 6TB Quadra using Intego Backup Manager Pro 1.0.9. The G-Raid has two folders 0_Clients and DATA which are shared through OS X Server.
Situation, told customer backup drive (LaCie) was almost full mid April, purge data. They didn't and backups stopped running at end of April. Yesterday, they accidentally deleted a folder / with files. User was on an iMac, connected to the share DATA when deleted. Called in a panic of course. New folder and files were created after the last back was executed.
Question - Folder and files were deleted but Trash was not "emptied". Researching, I learned about hidden trash folders. So, I was hopeful I'd find the info in the hidden /.Trashes folder on the shared Volume G-Raid. My understanding is that that's where it would go, until an "empty trash" is executed. I've shown all hidden files / folders via "defaults write com.apple.finder AppleShowAllFiles TRUE". Navigated to the volume G-Raid/.Trashes and the folder/ files are not there. Is there another location where they may possibly be??? Or, are they hosed and it's really gone "Deleted"???
Thx

With a locally connected volume e.g. a hard disk or USB flash drive, when you delete a file it does get moved to the 'Trash' folder and until the Trash is emptied can still be retrieved. However with a network volume if a logged in user deletes a file or folder it normally gets deleted immediately. (The user would get a message saying "This item will be deleted immediately. You can’t undo this action.")
So the likelihood is that the items are not in any trash folder even if you found and looked in them.
It used to be the case that even when using a network file server you still had the benefit of files first going to the trash folder but Apple stopped doing this a long time ago. The network trash folder would be at the top level of the network share. (If it exists and works.) Some NAS devices might still support it but as I mentioned I don't believe Apple themselves do.
So you could try using Terminal.app to look for an invisible folder at the top-level folder of the network share, if the network share is a folder called 'Fred' then this invisible folder would be in 'Fred' and would be called "Network Trash Folder". You can try looking for this either on the server or from a logged in client.
Do ls -la in Terminal.app the 'a' flag means show all including invisible files.
As you have probably guessed by now it is almost certainly the case these files are lost and cannot be retrieved. The users unfortunately are guilty of multiple mistakes.
They ignored your warning about the backup drive
They deleted something they should not have
They ignored the warning the Mac would have shown about "This item will be deleted immediately. You can’t undo this action."
I would add an additional error that they and perhaps you as their advisor are guilty of. Never rely on a single level of backup, ideally you should have a rotating set of backups i.e. one for each day - Monday, Tuesday, etc. and even more importantly should store these off-site unless being used so that in the even of a fire, flood or other disaster you still have intact backups.
In theory ACL permissions can be set to allow reading, allow writing but disallow deleting. Unfortunately in the real world trying to use the disallow deleting option is a waste of time. This is because many programs 'save' changes by saving a new temporary file, deleting the original file, and renaming the temporary file to the original name. This will not work if you block deleting.

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Empty the Trash if you haven't already done so. If you use iPhoto, empty its internal Trash first:
iPhoto ▹ Empty Trash
Do the same in other applications, such as Aperture, that have an internal Trash feature. Then restart the computer. That will temporarily free up some space.
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You can more effectively use a tool such as OmniDiskSweeper (ODS) or GrandPerspective (GP) to explore the volume and find out what's taking up the space. You can also delete files with it, but don't do that unless you're sure that you know what you're deleting and that all data is safely backed up. That means you have multiple backups, not just one. Note that ODS only works with OS X 10.8 or later. If you're running an older OS version, use GP.
Deleting files inside an iPhoto or Aperture library will corrupt the library. Any changes to a photo library must be made from within the application that created it. The same goes for Mail files.
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If you have more than one user account, make sure you're logged in as an administrator. The administrator account is the one that was created automatically when you first set up the computer.
Install the app you downloaded in the Applications folder as usual. Quit it if it's running.
Triple-click anywhere in the corresponding line of text below on this page to select it, then copy the selected text to the Clipboard by pressing the key combination command-C:
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Launch the built-in Terminal application in any of the following ways:
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If you do not need the files any longer, you can Drag them to the "Trash", then "Finder -> Empty Trash". Once you empty the trash you cannot get them back.
Or are you talking about something else. If so, then please provide more details.

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Try erasing free space using Disk Utility.
Erase free disk space
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I hope I helped.
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