I tend to agree with @
@Sunfish . Birchbox's homepage advertised for the last week or so that for November there would be an "LOC shadow Stick in every box," though I notice now that the site no longer says that. However, at the time you and your mom were subscribed and issued boxes, that was the advertisement. I think they do need to be held accountable to what they advertise.
But, discussions of marketing ethics aside, I would just send off a quick message to CS, expressing puzzlement why you didn't receive the featured brand, when the understanding was that each subscriber would receive an LOC item in November. If nothing else, they may send some sorry points your way.
(Edited for autocorrect gibberish)