The aircraft construction number 4681 of the Douglas Aircraft allowed it to be positively identified as CNAC 60.

This makes it 41-18556

from http://www.joebaugher.com/usaf_serials/1941_3.html

41-18556 (c/n 4681) to USAAF Sep 02, 1942 – 10th AF, India Oct 14, 1942. Diverted to Chinese National Aviation Corporation (CNAC) Dec 18, 1942. Missing during flight from Kunming to Dinjan Nov 17, 1942.