The change in being able to hand in the 325p i believe was about the same time they made coin weightless. It became pointless having discernable differences between 325p and 3250gp if it weighed the same and didn't have any bearing on you.
Truthfully... it's the sort of thing i'd make sure to research before handing it in, as well as asking a few people in guild / ooc etc.
It's not like you walked away completely empty handed, you learnt a valuable lesson. And that might be worth more in the long run
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