As mark says, a 2-box machine is what you want for cache hunting. Not necessarily because it can detect a box-sized object than conventional detectors, but a bigger part of the reason (IMHO) is that they don't see anything smaller than a soda can. That makes them the "perfect discriminator" to ignore nails, pulltabs, pesky individual coins, etc... Because if you go out with a standard machine thinking "I'll only dig big signals" or "I'll ignore all small sounding stuff", etc... you will spend forever and a day second-guessing sizes of objects. So just get a 2-box unit, like the TM 808.
But as Mark says too: Mexico is filled with superstitions , legends, lores, etc... Everyone thinks a treasure is "certainly in every cave". Why? Because someone told someone, who told someone, who told someone, who told someone, who told ......... well, you get the picture. Just fanciful stories. And to test that theory: the next time you hear of a box of coins that someone down there supposedly discovered, start asking key questions: Ie.: did they actually SEE the coins for themselves?? Because the minute you start asking questions of these supposed discoveries, you will see they fall apart. For example, the person will say "well, I didn't actually see them for myself, but my brother in law saw them!!". So you track down that brother in law, and quizz him. Turns out he didn't actually see them either, "but he knows the guy, who knew the guy". So you track down THOSE persons. Turns out they too never actualy saw it. But no problem, because they too heard it from a reliable source. So you track down THAT "reliable source". And guess what? I goes into infinite regression! At some point you come to realize, there NEVER was a treasure, and it was dreamed up 40 yrs. ago as a fun story to tell the grandkids before they went to sleep at night, or a guy who drank too much tequila, then saw "smoke coming from the ground" or "had a vision where he saw sparkles on the floor of the cave" or some such nonsense.
But hey, you never know. So get a 2-box unit, and let us know how you do
