Yes, sadly they are legitimate emails so its hard to block them. The problem seems to be on zendesk side where they are accepting any email as the source of the ticket and simply replying to that email with the contents of the ticket.
Apparently they are well aware of this problem since at least last year:
I imagine the consumers who took their products home in the free box will then recycle the box. So the recycling company gets the box anyway and not another plastic bag.
Apparently they are well aware of this problem since at least last year:
https://support.zendesk.com/hc/en-us/articles/9833274501786-...