Delivering the letter

Now I'm finished. Please deliver this Letter to Archer Trainer Reduros of Tor Fortress. I wrote a thank you letter to him. I was able to find the Proof of bow that Gorgan is very thankful for. He may be extremely satisfied when he receives this Letter. What? Didn't he sell the old map to me at an high price? Hm. It wasn't that expensive. If it had been too expensive, I wouldn't have been able to buy it. Anyway, this is a sign of my gratitude so please deliver it for me.

Please deliver this Letter to Archer Trainer Reduros of Tor Fortress.

Huh? Proof of bow? The map was able to find such a thing? More importantly, there is a problem so please help me.