From the blog of the Gettysburg National Military Park:

May 12 , 2016

The packages seem totally innocuous. Not very large. Slightly heavier than you might expect for their size. Addressed to Gettysburg National Military Park, but not to a specific department or person. Often without a return address. Not terribly unusual at all.

Except for the curse.

The boxes in question hold rocks. Rocks that were previously removed from the park, and are now being returned. In almost every case, they also contain a letter, such as the one below, received in May of this year:

It is important to remember that removing rocks from the park is a violation of Chapter 36 of the Code of Federal Regulations. Section 2.1(a)(1)(iv) prohibits “Possessing, destroying, injuring, defacing, removing, digging or disturbing from its natural state a mineral resource or cave formation or the parts thereof.” If these individuals had been caught in the act, they would have been cited and fined $100, plus a $30 processing fee. All in all, they may have preferred that.