All the hypotheses are open. They're going to have to see how the corpse has arrived. One of the options is to have arrived in a truck that picks up the containers.
The Jundiz biocomposting plant treats organic waste, pruning debris and rejection garbage bags. This is the step leading to the disposal of waste in the Gardelegui landfill.
According to the first information, the body has been found while the remains of the containers containing the rest were separated.