secret file rubber stamp

abstruse ambiguous arcane book brief cabinet camouflaged case census charts classified cloakanddagger close closet concept confidential covered covert cryptic dark data deep directory disguised docket documents dogcart dossier esoteric file folder furtive grunge grungy hidden hushhush index information ink list miscellaneous mysterious mystic mystical notebook obscure occult outoftheway pigeonhole portfolio private quiet record rectangular red register repository rubber secluded secret sign stamp symbol undercover underground undisclosed unknown unseen