04/04/2018
USCIS announced that starting 4/2/18, it will destroy permanent resident cards, employment authorization cards, and travel documents returned as undeliverable by the U.S. Postal Service after 60 business days if USCIS is not contacted with the correct address.
Make sure you update your address with USCIS (no more than 10 days) after you move and have your receipt numbers available for any pending cases!