buy the une's mirror, the doga's artifact, the griffin's heart, and the rat tail. Then you have to sell those items to certain people around Treno. The people will offer you gil and sometimes you can have them raise their offer. Here is the resell list:

Une's Mirror---sell to the Nobleman walking towards the cafe for 12,000 gil. if you persist then you can sell it for 15,000 gil


Doga's Artifact---Scholar in synthesis shop for 10,000 gil the first and only time.

Griffin's Heart---Adventurer at the Cafe for 8,000 gil the first time and 10,000 gil the second.

Rat Tail---Adventurer at the Cafe for 20,000 gil the first time and 25,000 gil the second

After that anytime in disk three go talk to the guy in daguerreo about the excaliber I. then at the begining of disk four go straight to the auction house in treno and the magical fingertip will be there. That is how it has always worked for me.

if this didnt work just email me at skatetoomuch17@hotmail.com and i'll try to find another way.