@casteryvan, I did a quick re-scan of everything so I may have missed some things. Initially I think I got the value of Cleria's mythril armor mixed up with the reward money. I see that the reward money was roughly 220,000 (rounding it up) and the armor smith said her armor was worth 400,000. Apologies there. The only other thing I noticed that threw me off was the switch from Guinea, to Silver coin to Gold coin, but I didn't think that was a translation error, however it didn't help gain an understanding of the value between the three.
However, the 400,000 versus 4,000 number that was in my head started with chapter 12 when Cleria and her Uncle Ludovic were discussing the enemy's numbers and they said the main enemy force was 400,000 strong and heading towards them. Their main force, if they pulled them all together was 5,000 less than that which should be 395,000. Of course, their messengers were intercepted so they were only working with whatever forces the Ludovics had and their allies around them and I didn't see a number. In the next chapter when they are getting information on the battle from Turas, the main enemy force suddenly dropped to 4,000? Images below:
Chapter 12
Chapter 13