Be aware, your timelines are not synchronized. After the last time you saw Keiji, he left to consult with the elders of his monastery. In the meantime, Jaster and Curf have remained in the city and ... accepted temporary employment. Keiji's timeline is a week or more ahead of Jaster/Curf's.
Aye, that's right.
Flashback: before you got more than a day out of Lafierre, you hear in your mind very clearly "I need to find out what we got from our excursion the other night. Name a time and place. You can bring friends." You recognize the voice as Jaster's, and feel that a short reply would be appropriate.
The official takes your 280 gp and casts the spell.