Wagner notes that in his side of the exchange of letters with preserved in the Dasheng dayi zhang 大乘大義章 T1856 (XLV) 130c27-28, Lushan Huiyuan 廬山慧遠 mentions [appears to mention? --- MR] a *Dharmakāya-sūtra 法身經. He cites Liebenthal, who speculated that this title corresponded to the 寶積三昧文殊師利菩薩問法身經 T356 ascribed to An Shigao 安世高, which is paralleled by a second translation ascribed to *Jñānagupta/Jinagupta, 入法界體性經 T355.
[Note that Nattier 2008 does not consider T356 a genuine An Shigao work, and in fact, gives it as the example of her silent method of dealing with inauthentic works, p. 29 and n. 60 --- MR.]