Tar-Mach noticed quite easily that the Decepticon was considerably larger than himself. He did make progress, though it was slow, and in doing so, he began uproot any plants that were in the way, move any rocks, and just generally make a shallow (yet easily visible) trench. He had to stop, though, when the Decepticon got jammed against a tree trunk, nearly damaging his memory unit.
Havoc cruised along quietly, his repulsors keeping him from coming in contact with the ground. The first logical place to search was obviously the last place that they had seen Ojitron. Sure enough, very close to the first tower, he managed to find what was probably the biggest give-away: his arm. He picked up various small components from around it, and began walking back to the 'camp', picking up what little bits he could. It was unlikely that he'd be able to find EVERYTHING, but he would certainly be able to pick up enough of the pieces that the rest wouldn't be very noticeable.