City of Olney issued the following announcement on Dec. 13.
Santa has received many letters from children who have mailed them from the Bower Park Letters to Santa mailbox. To be sure Santa receives the letters in time, he asks that children mail their letters from Bower Park no later than Tuesday, December 18, 2018.
It's very important that children include their full name and address so Santa can reply. There is no need for a stamp - Santa has pre-paid all of the postage!
Original source can be found here.
Source: City of Olney