I recently purchased a black plastic Interarms case from a 42,xxx serial number range Walther PP in .380 caliber. Included where the owners manual, warranty card, test target, cleaning rod, indicator tool and flat base magazine - essentially everything except the pistol & footed magazine. Upon receipt, I was somewhat surprised to discover the flat magazine was unmarked. There is no Walther banner, caliber designation or witness hole numerals. Given the overall condition and originality of the box & contents, I expected the magazine to be OEM Walther. Can anyone comment on the originality of this magazine? Thanks!