You might be able to get a Missing Air Crew Report (MACR) regarding PFC Massey. I found a Harold Massey listed in one MACR database online, but you have to pay for further info. Dave Berry is always very informative on these matters (MACR's and just about any other research info), and can tell you more than I can in that regard, I'm sure. He will probably weigh in with some help. In the off chance that he does not, I will give you a couple of leads to follow on the MACR.
As for Private Davidson, have you been in touch with the division vet association? If not, they might be worth a try. Their web address is: http://home.att.net/~victory24/index.htmhttp://home.att.net/~victory24/index.htm