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Spoofing the user agent may not work, because your IP will still give you away.
I would check the cache copy first. And if they have disabled cacheing without good reason, then that would be an indication that they may be up to no good.
Also check the "snippet" (description) for various searches in which they come up. Google pulls this text from portions of the page it thinks are "relevent" to that specific search, and this text will change depending on what search you do.
If you find a "snippet" on one of those searches where the same text does not appear when you view their page, you got 'em! :)