Affiliate Marketing Secrets

I’ve been subscribed for a while, so no, no processing required.
Both of the websites say that they have shipped the Nov. issue of both magazines, and I have gotten my Bon Appetit and Marie Claire magazines (Bon Appetit & Teen Vogue are affiliated, so are Seventeen & Marie Claire).
There has been a history of not receiving magazines from these companies, but since I reported about 5 of them not arriving, there hasn’t really been any such case. That was around last year.
However, my magazines usually come before now and I’m wondering when I should report them missing. Sometimes if you report them missing early enough you actually get that month’s magazine instead of them just extending your subscription.
Thanks!