γραμματοφυλάκιον
From LSJ
ἐν ταῖς ἀνάγκαις χρημάτων κρείττων φίλος → it is better in times of need to have friends rather than money, a friend in need is a friend indeed (Menander, Sententiae monostichoi 143)
English (LSJ)
[ᾰκ], τό,
A a place for keeping records, Plu.Arist.21, OGI669.23 (i A. D.), IG5(2).516 (Lycosura, i A. D.), 5(1).20 (Sparta, ii A. D.): in pl., τὰ τῆς πόλεως γ. BGU913.4 (iii A. D.). II deed-box, EM412.38.
German (Pape)
[Seite 504] τό, dasselbe, Plut. Arist. 21.