Vixo and Skalisss don't find any additional traps in the room. They are unable to see what those trigger plates by the entrance in fact trigger, but as long as no one steps on them, they can probably live with that.
The sarcophagus in the center of the room bears no signs of traps, and the heavy stone lid looks like it could be removed with a good solid push by the stronger members of the group.
Likewise, the pedestal at the back of the chamber, with the onyx rib bone, appears to not be trapped. To all appearances, it seems as though Skelleks was relying on the earlier traps and his skeleton minions to prevent anyone from disturbing his rest.
Vlastos notes that the floor shows no signs of wear. The seven skeletal guardians must have simply stood in place these hundred years that the tomb has been here. The tomb certainly shows no signs of any traffic before the party's arrival and the ensuing battle.
Trevor detects no magical auras.