Most efficient way to delete "removed" photos from hard disk?

Hello everyone! Glad to have this great community to come to for help. I searched for this question but came up with no hits. If it's already been discussed, I apologize and would love to be directed to the link.
My wife and I have been using LR for a long time. We're currently on version 4. Unfortunately, she's not as tech-savvy or meticulous as I am, and she has been unknowingly "Removing" photos from the LR catalogues when she really meant to delete them from the hard disk. That means we have hundreds of unwanted raw photo files floating around in our computer and no way to pick them out from the ones we want! As a very organized and space-conscious person, I can't stand the thought. So my question is, what is the most efficient way to permanently delete these unwanted photos from the hard disk
I did fine one suggestion that said to synchronize the parent folder with their respective catalogues, select all the photos in "Previous Import," and delete those, since they will be all of the photos that were previously removed from the catalogue.
This is a great suggestion, but it probably wouldn't work for all of my catalogues since my file structure is organized by date (the default setting for LR). So, two catalogues will share the same "parent folder" in the sense that they both have photos from May 2013, but if I synchronize May 2013 with one, then it will get all the duds PLUS the photos that belong in the other catalogue.
Does anyone have any suggestions? I know there's probably not an easy fix, and I'm willing to put in some time. I just want to know if there is a solution and make sure I'm working as efficiently as possible.
Thank you!
Kenneth

I have to agree with the comment about multiple catalogs referring to images that are mixed in together... and the added difficulty that may have brought here.
My suggestions (assuming you are prepared to combine the current catalogs into one)
in each catalog, put a distinctive keyword onto all the images so that you can later discriminate these images as to which particular catalog they were formerly in (just in case this is useful information later)
as John suggests, use File / "Import from Catalog" to bring all LR images together into one catalog.
then in order to separate out the image files that ARE imported to LR, from those which either never were / have been removed, I would duplicate just the imported ones, to an entirely separate and dedicated disk location. This may require the temporary use of an external drive, with enough space for everything.
to do this, highlight all the images in the whole catalog, then use File / "Export as Catalog" selecting the option "include negatives". Provide a filename and location for the catalog inside your chosen new saving location. All the image files that are imported to the catalog will be selectively copied into this same location alongside the new catalog. The same relative arrangement of subfolders will be created there, for them all to live inside, as is seen currently. But image files that do not feature in LR currently, will be left behind by this operation.
your new catalog is now functional, referring to the copied image files. Making sure you have a full backup first, you can start deleting image files from the original location, that you believe to be unwanted. You can do this safe in the knowledge that anything LR is actively relying on, has already been duplicated elsewhere. So you can be quite aggressive at this, only watching out for image files that are required for other purposes (than as master data for Lightroom) - e.g., the exported JPG files you may have made.
IMO it is a good idea to practice a full separation of image files used in your LR image library, from all other image files. This separation means you know where it is safe to manage images freely using the OS, vs where (what I think of as the LR-managed storage area) you need to bear LR's requirements constantly in mind. Better for discrete backup, too.
In due course, as required, the copied image files plus catalog can be moved bodily to another drive (for example, if they have been temporarily put on an external drive, and you want to store them on your main internal one again). This then just requires a single re-browsing of their parent folder's location, in order to correct LR's records inside this catalog, as to the image files' changed addresses.
If you don't want to combine the catalogs into one, a similar set of operations as above, can be carried out for each separate catalog you have now. This will create a separate folder structure in each case, containing just those duplicated image files. Once this has been done for all catalogs, you can start to clean up the present image files location. IMO this is very much the laborious and inflexible option, so far as future management of the total body of images is concerned... though there may still be some overriding reason for working that way.
RP

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