(AP) — Police in a south-central Kansas town say they’ll probably never know who donated a grenade to Goodwill.

Workers at the Goodwill store in Derby came across the grenade while sorting through donations Wednesday.

The building was evacuated while the device was removed. A technician from the Wichita bomb squad inspected the grenade and determined it wasn’t live.

No one’s sure if the grenade was brought to the store or left in a Goodwill donation bin. Derby police say they consider the case closed.