Do remember though if its where people may stand, the dirt will pack, and could actually snap an amp or something. Put it inside a small sturdy container after you wrap it up to seal it the best you can.
You would be surprised how COOL the earth is a couple feet down bro. About 3-4 feet deep and its like a mini fridge as long as the sun isnt shining down the hole, so considering you will be burying it it should be fine.
Just put em in zip lock baggies, wrap that in ceran wrap, put that inside a small container of sorts, personally I would cock the container. Then wrap that in 2 trashbags. Use an old empty protein container or something!
BTW hell yeah, imagine finding a pirate map leading to a large stash of Test E, Deca, hcg, etc lol. SCORE!!!!