If you can't see them it's likely the person who posted them deleted them from their image hosting account. In regards to the classifieds, a lot of guys will delete the pic's shortly after an item sells.
Another thing you may notice is some of the images hosted by PhotoBucket are blury. Photobucket just started doing this recently and I'm not sure what triggers it, but my guess is that after so many views per day they go from clear to blurred. Basically they're trying to get people to buy one of their memberships/packages by doing that.
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