SALT LAKE CITY (AP) — Two rare copies of the Book of Mormon were reported stolen from the Institute of Religion at the University of Utah.

An 1840 Nauvoo edition and an 1841 Liverpool edition were stolen from the institute sometime in the past two weeks.

The books have an estimated value of about $20,000 each.

Institute director Allan Gunnerson said the safe that held the books was discovered missing Tuesday. Police estimate it could have been stolen as far back as Oct. 24.

“It’s one of two safes. It’s one we don’t use all the time,” Gunnerson said. “It’s in a secretary’s office. It was in a cabinet.”

The secretary who works in that office had been out of town for a couple of weeks. Gunnerson said the institute wasn’t exactly sure Thursday of the last time the books were known to have been seen.