Pawnshop owner discovered the graphic photos after agreeing to sell a photo album for a customer.
A client had asked him to try to sell the book, which "had been in their family for years," he said.
"This is the most disturbing thing I've ever seen in my career, and I desperately need your guys' help," Kail, owner of St. Louis Park Gold & Silver, said, seeking experts to authenticate the find.
There were memorabilia items included in the photo album, and Kail believes they're an indicator of who the photographer is.
In an update video, Kail let his followers know that he was trying to track down an expert in Minnesota to help determine the value of the photo album.