To be fair, what was in the package was the book that is supposed to accompany the Ultra High Relief Saint-Gaudens $20 gold piece that the Mint is selling this year.
The Mint had starting shipping coins without the books so that collectors didn’t have to wait for their coins while the Mint worked out the problems in acquiring the books themselves.
The collector I heard from apparently received his coin before the new policy took effect because he contrasted not signing for the valuable coin but having to sign for the much less valuable book.
This event follows a change in policy on signatures. Prior to March 13, signatures for the very valuable coins were not required. After that date, they were.
This policy change occurred after collector complaints were heard about these gold coins being left on doorsteps without the recipients having to sign for them. So the Mint showed it was responsive to its customer base.
What’s the Mint to do now?
In this case, the wise course is to treat it as an anomaly and ignore the complaint.