Hole dug to where there's 3+' above the top of the container. I'd suggest a big army surplus pelican box. Big enough to store it.
Add a foot of dirt on top of the sealed box. Throw a few chunks of metal on top of that. Brake rotors, bicycle handle bars, general metal crap. Fill the hole up. The dirt has to be compacted or you'll get an low spot.
Take a couple gallons of high test sugar water and pour all over the spot. Camouflage till the vegetation grows back.
Map the location.
Please explain the bolded part.