The Heritage Canadiana site is using the LAC war diary reels. Every bit is included. Sometimes it gets very tedious when a great deal of useless information is included, which takes a long time to wade through. Some units sent out daily strength returns during the mobilization phase, some weekly, and most not at all. This is true for other reports as well. For example, 2nd Field Battery RCA has 2016 entries for the period from 1 September 1939 to 31 May 1940, while 28th Field Battery RCA has 256 entries for a similar period. It is not a matter that there are files missing but rather each unit had a different system as to what they placed in the diary. What I find confounding early in the war are units that include one page for each day of the month, particularly when all that mentioned is the weather! On the other hand, some units place the entire month's log on one page with only a few days highlighted. I did find a file sent from the NDHQ to units after a number of months of receiving war diaries. It basically told the units what they were doing wrong with their war diaries. Things seem to get better early in 1940.