The whole point of the IDB is you're supposed to name and identify the functions yourself (by default, only the main OnPacket functions are named, sometimes a few others by AoB). You use PDBs (like v95) for comparison to confirm which function is which. Once you know the name of the function, the switch-case is giving you the opcode. Also, to make it easier, you can find opcodes close to it and then +1 or -1 them and confirm (Nexon always adjusts them in shifts based on the pool).
DestroyClock = 0x74 (always a few after Clock, confirmed from Warn + 2, SetObjectState + 1)
SetGender = 0x37 (confirmed from GuildBBSPacket - 1)
TradeMoneyLimit = 0x36 (confirmed from SetGender - 1)