Cardboard = Camoflouge
If you are handy with an Exacto knife and tape and are old enough to read Harry Potter then take some time to improvise a makeshift locker or cooler for your stash with a cardboard shell. No one will notice, trust us.
Remember Dexter. Well he used to store his stash in an air vent. So can you :) Not many people, exp your parents will ever think to look