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Getty is pretty well known for pursuing people who use their pictures although I have never seen them sue anyone who has only used a couple of them.
Under copyright law it doesn't really matter where you got the pictures, if they are copyrighted images then you are in violation of the law and could still have to pay damages although if you took the images down immediately upon being notified and could prove where you got the images from then you may be able to avoid the really high statutory damages.
You can do a Google search on the images and that may show where you obtained them. However, if you do try and show that yo got them from a "free" site you may want to get a local lawyer to actually contact Getty for you since there is a better chance the lawyer can get them to pursue someone else.