I pushed the boulders under the totems but nothing happened. Are they supposed to go somewhere else or will that part of the map be opened later?
Turalyon You're supposed to place them on the footprints by the totem poles.
Stones don't do anything necessary for the quest but you'll get a hidden bonus if you put them on the footprints as advised above.
Roeland All hidden stuff is marked in blue on the wiki maps. Many of them this event.
Also Challenge 1 Suitcase bonuses: