Hundreds of pairs of shoes, along with articles have clothing, that belonged to prisoners of a Nazi concentration camp have been discovered scattered in a Polish forest.

Among articles of clothing found were children’s shoes, belts and pieces of the stripped uniforms that were once worn by Jewish and Polish prisoners back in World War II. The forest is located next to the infamous Stutthof Nazi concentration camp, which claimed the lives of an estimated 85,000 people, according to a UK Telegraph report.

The camp had a horrendous reputation for supplying slave labour to the Nazi army and was also the site of Nazi experimentation into making soup from the fat of some of its thousands of victims.

“I’ve been working here 30 years and none of the employees have ever heard of these items lying in the forest near the museum,” said Danuta Drywa, head of archives at the museum. “To define exactly what kind of shoes they are, how old they are and what country they came from will need specialised testing.”

Unknown as to why the items were undetected for such a long period of time, Drywa claimed it could be because they may have once lain in the camp’s rubbish tip.

Another possible explanation is that the museum sits on a small patch of the area that Stutthof once covered. During its active days, the camp grew and downsized relative to the needs of the manufacturers that used the prisoners, so the forest may once have been part of the facility.

Typically when prisoners arrived at Nazi run concentrations camps they were stripped of their clothing and shoes, with the good footwear being given to Germans. Despite some theories as to how clothing is just being found after all these years, the findings, nonetheless, remain a mystery.