Ken, I got a copy of the Wiles diary from the Newberry Library in Chicago. I think these Robertsons' you mention are indeed the same Robertsons' Wiles corresponded with during the war. Here is a link to the description of the diary & a brief bio of Wiles.

https://i-share.carli.illinois.edu/nby/cgi-bin/Pwebrecon.cgi?BBID=183037