I'll move in to listen

You use the rows of boxes and your powers to your advantage to climb up as you move closer. You are able to hear them much better now, although if you make a wrong move or move further in they would probably spot you. You try to get as many information as you can from listening to them. Their talking about having to bring back "the target" to headquarters. Depending on what the target is you might have to act differently. If it is a person you should probably stop them before then, but if it is some kind of item it would probably best to track them to their base. You hear them say that they have to be ready to get in the van, which confirms that they will be escaping with one. You hear a mechanic door opening and closing before there is some more commotion. Seems like they are getting ready to leave. You could probably stop them from exiting the building by stopping the van and beating them up, but you could also try to follow them to their base to find out where that is.