Here's proof/
Ecce indiciumLewis and Short on ex or ē (ex always before vowels, and elsewh. more freq. than e; e. g. in Cic. Rep. wrote:B. Transf.
1. To indicate the country, and, in gen., the place from or out of which any person or thing comes, from: ex Aethiopia est usque haec, Ter. Eun. 3, 2, 18 : quod erat ex eodem municipio, Cic. Clu. 17, 49 ; cf. id. ib. 5, 11.--Freq. without a verb: Philocrates ex Alide, Plaut. Capt. 3, 2, 10 : ex Aethiopia ancillula, Ter. Eun. 1, 2, 85 Ruhnk.: negotiator ex Africa, Cic. Verr. 2, 1, 5 : Epicurei e Graecia, id. N. D. 1, 21, 58 : Q. Junius ex Hispania quidam, Caes. B. G. 5, 27 : ex India elephanti, Liv. 35, 32 : civis Romanus e conventu Panhormitano, Cic. Verr. 2, 5, 54 Zumpt; cf. id. ib. 2, 5, 59 fin.: meretrix e proxumo, Plaut. As. 1, 1, 38 ; cf. id. Aul. 2, 4, 11: puer ex aula (sc. regis barbari), Hor. C. 1, 29, 7 : ex spelunca saxum, Cic. Fat. 3, 6 : saxum ex capitolio, Liv. 35, 21, 6 : ex equo cadere, Cic. Clu. 32, 175 ; cf. id. Fat. 3, 6; Auct. B. Hisp. 15 et saep.--
I'm writing in Latin hoping for correction, and not because I'm confident in how I express myself. Latinè scribo ut ab omnibus corrigar, non quod confidenter me exprimam.