That sub-forum is something that the prudent seller scans regularly.
In case you don’t feel like reading it right now, the important part says this:
For orders placed on Amazon.com, most items delivered between March 1, 2020, and April 30, 2020, can now be returned until May 31, 2020.
Yes, sorry to say, you do have to accept that return. Even if the customer hasn’t contacted you prior to shipping it.
But you don’t have to process that return as quickly as before. Again, from the announcements sub-forum: