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Looks to me like it doesn't give a 404 it accually send the search and says it couldn't find what we are looking for.. so to me I think it might be that the page might now be there or its more into the script then what you gave.. but not sure.. can we see more of the script?
Looks like the form is being outputted. If youre having problems its probably on index.php, the form action processing script. Also noone here has any idea what "your search engine" is