You are allowed to post unboxing videos of unreleased product no earlier than 4 days before the product's earliest on-sale date, and only after the full card set has been previewed through official channels. If you are posting content previewed by Wizards of the Coast or an approved 3rd party before the official release, be sure to clearly indicate the release date wherever this content is posted.
If you receive product or cards from a set before it has been fully previewed, you may have received that product in error. If this happens, please do not share or advertise product content that has not been previewed and reach out to WPN Retail Support for further guidance.