When Saeradan asked you to search near the Mustering Tree and the Tree of Tribute for signs of other evil tokens, he gave you a pick-axe with which to dig them up... which you promptly lost.
'${PLAYER}! I am disappointed. If we are to unravel the mystery of this wood, we must find more tokens... yet you managed to lose the pick-axe I gave you? Very well, let me see if one of these Rohirrim brought a pick with him into these wilds.'
Saeradan is at the Rohirrim scout-camp in the Gravenwood of Dunland.
Saeradan has spoken with the Rohirrim and is waiting upon you.
The Tree of Tribute lies to the west of the Rohirrim Scout-camp.
You should return to the Tree of Tribute and complete the task Saeradan set before you.