No Authorized Recipient Available

You can do two things.
1. Depending on your neighborhood, you can go find him when he is on his route and ask him if you can have the package. Make sure you have the notice he left and picture ID, a drivers license would do that shows street address.
2. Call the Post office, and ask them what time the carrier comes back to the post office and pick it up then.
3. Wait until tomorrow to get the package.
4. For packages that DO NOT require signatures, you can log onto USPS.com and fill out a release form online. If the carrier thinks thats a safe avenue, he will release the package. AGAIN, this is NOT for things you have to sign for.

Your package may have been insured. If the seller forwarded you a tracking number, you can enter it in at the USPS home page and the results will tell you if it is insured or signature delivery. Most small and medium sized FLAT RATE priority mail boxes come with $50.00 insurance, 100.00 on the large Priority mail FLAT RATE boxes.

Update- I got the mailing the next day. The statement I quoted was not on a note left in my box- it was what I saw when checking on line for tracking information. I should know by now that USPS tracking info is not exactly always to be relied upon- this may have been some glitch in their system. The mailing was not sent with any signature requirement so all is ok now- BTW, it is a beautiful coin- a 1939-s Jefferson.