Check this https://xp-dev.com/svn/aCis_public/aCis_gameserver/java/net/sf/l2j/gameserver/handler/admincommandhandlers/AdminCreateItem.java
As you can see, it returns getCoinId(), so you send message like "You choose " + getCoinId(st.nextToken()); under your bypass. Depends of your code.
You can basically base on it.