Hmmm to be honest its kinda big problem for players like me.
It would be helpful.
First, so You can actually track time left to unlocking Your coins after sell.
Second, for players like me with many transactions, so I could actually trace history of my char purchases/sells.
There is tab on website where You can see the char You've sold (Realm, race, class, name, amount of coins, some info about eq), but w/o date. I'd suggest to add to this one column: "Date of transaction". It should be easy to do and actaully helpful for people that are waiting for unlocking coins - it might reduce amount of question asked about it on forum as well.