Definition of "stashbox"

People here are much more likely to have the 3 volumes of Marx's Kapital (cheap in East Berlin) on their shelves than a stashbox full of cannabis.

1983, Mitch Cohen, Berlin, Contemporary Writing from East and West Berlin, Bandanna Books, page 19

Inside the van was everything Chesley needed in this world: a mattress to sleep on, his toolcase, his stashbox, and a towering blue glass bong.

2001, Mercedes Lackey & Rosemary Edghill, Baen Books (2001), unnumbered page

He offered me ravioli and pot from the stashbox where he kept his coke and rolling papers, […]

2009, Julie Klauser, I Don't Care About Your Band: What I Learned from Indie Rockers, Trust Funders, Pornographers, Felons, Faux-Sensitive Hipsters, and Other Guys I've Dated‎, Gotham Books, published 2010