Given that Mr Crowley is long since deceased I think the reward should automatically fall to the runners up, though to honour Crowley for indeed it was his entry which won he should certainly receive an honourable mention (Indeed, it's certainly what he would have wanted, having been a bit of an arrogant sod.)

Tip is not the first to cheat in a contest and certainly won't be the last. The team running this event has underestimated the natural human desire for attention and praise regardless of how small and concordantly the human tendency to use underhanded methods to achieve its goals. This is perhaps to their credit, as it displays that unlike myself they are not a bunch of cynics and still have some faith in humanity. :lol

While google searches are not a sure fire way they are still very useful; Placing random excerpts from a text into google will usually bring up that text. Of course, obviously some texts will have similarities to others; I have seen instances where people have replicated nearly an entire sentence innocently (Perhaps subconsciously) so when the results come up quickly scanning through it to ensure it is plagiarism and not just bad luck is a must. There are multiple tools on the internet for checking plagiarism; While they are not the most reliable tools (Indeed, they sometimes pick up original work as being plagiarised), should you run a text through two of these tools and they both return a 'plagiarised' result then at least you know what to look into with some more depth. Naturally, you will not catch people out people 100% of the time but had this been done the offending entries would have been discovered and removed. In fact, just google searching the first two lines of 'Conquer all' brings up 'Power', the original work. 

tldr; In my experience, I have found that most stolen work can be found simply by putting the beginning or end of several paragraphs into a search engine individually and checking them. Plagiarism tools can be lying bastards but can lend a hand in knowing what to give more attention to.