Businesses that use small black boxes and red envelopes can see them.
First of all, there are only Tmall products in Taobao's black box. No matter what type of red envelope merchants you use in the background, Tmall stores can see the details.
Secondly, Tmall's black box is only for Tmall merchants to participate in activities. Anyone who takes part in the activity will pay part of the cost if they use the black box.