If you have the calendar already it should be easy to determine if the missing records only represent particularly "suspicious" meetings (ie implying targeted intent), or it was common enough for everything else. That most basic & key math is missing from the OP. Missing some info for 75 entry out of thousand page calendar isn't in itself a smoking gun.
I have learned in this thread that for there to be anything suspicious one must posess the conservative Clinton contempt gene or be suffering from lSanders sadness burn. All rational people know there is nothing suspicious here. After all, the AP is just an appendage of Fox News.
Personally however, and speaking as a biased fanatic, I thought the AP article very fairly laid out the facts so that objective, but apparently extinct Martians could draw their own independent conclusions.
Personally, again, I looked at the fact that there is resentment on the Sanders side toward the democratic partiy's increasing coziness with money and the nature of who the missing data involved and came to the conclusion it looked to be no accident such details were withheld and that it took a lawsuit to pry them out. But that, naturally, is because I'm crazy.