The four men pleaded not guilty to targeting an American in an alleged attack at a holiday apartment.
The attack saw 23 children and the facility's proprietress kidnapped by gunmen on Sunday.
The authorities are investigating but early reports suggest bad weather and poor visibility may be to blame.
The artefacts will be returned and displayed in an exhibition in Serowe opening on 27 May.
Ethnic Tuareg fighters say they are in control of Kidal following a weekend of nationwide attacks, alongside Islamist groups.
Kenya's Sabastian Sawe on becoming the first person to break the two-hour barrier for the marathon.
Kenya's Sabastian Sawe on becoming the first person to break the two-hour barrier for the marathon.
The dispute was initially between two families before escalating into a cycle of reprisal attacks.
The UK's maritime monitor has reported at least four suspected piracy incidents in the past week off the coast of Somalia.
A wave of coordinated attacks by jihadist militants and separatists has spread through the country.