If I were given.... say.... 100 semi-trailers full of crates and given six months to hide them anywhere in the state of California with full governmental cooperation unlimited funding and total secrecy (breaches punished by death)......
How long do you think it would take you and any 200,000 folks you coose to find the crates?
After offering substantive rewards including amnesty from prosecution to former, high ranking members of that government and common soldiers and scientists for information as to the crate's whereabouts, backed up by an extensive intelligence service that has information from agents that were in the country prior to the 'treasure hunt' starting?
I'd say about 6 months tops and that's being generous. My plan of action would be a little more in depth that a couple of guys with a metal detectors and a book of popular phrases such as "Have you seen any nasty chemicals around here recently?"
And let's not forget what the 'swingometer of plausibility' showed before and after the conflict; the sources showing indisputable evidence that Iraq had weaponized WMD ready to go in 45 minutes now suddenly dissappeared with end of the war.
You've got to admit these are interesting times - I wonder how history will record the current events?