The traditional blue drop-off box at your local post office may soon be changing.

Earlier this year, the U.S. Postal Service announced it was installing 10,000 new high-security blue collection boxes in what they described as “high-security risk areas.” USPS said it is continuing the process of evaluating where other enhanced security boxes should go with plans to install several thousand more in the future.

In some areas, the blue collection box may be going away entirely.

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“In specific locations where a blue box is a repeated crime target and/or mail density is very low, collection boxes may have to be removed entirely when access is not meaningfully diminished due to nearby access points,” USPS said in a statement.

The changes are part of the Project Safe Delivery campaign launched this summer to crack down on postal crimes, including attacks on postal employees and mail theft.

“We have effectively focused our efforts with USPS on hardening both physical and digital targets to combat threats to postal employees and secure the mail. We continue to turn up the pressure and put potential perpetrators on notice; If you attack Postal employees, steal the mail, or commit other postal crimes, Postal Inspectors will bring you to justice,” said Chief Postal Inspector Gary Barksdale.

In addition to more secure boxes, USPS is also replacing old “arrow” locks with 49,000 electronic versions. Criminals have targeted Arrow and Modified Arrow Locks, or MAL, keys,  using them to steal mail from secure boxes. More than 6,500 of the old locks have been replaced with plans to install 42,500 more in coming months.