Lol I'm using eAthena so try src/map/guild.c around line 410 or so.. or just look for this:
Line 410: if( battle_config.guild_emperium_check && pc_search_inventory(sd,714) == -1 )
Line 437: pc_delitem(sd,pc_search_inventory(sd,714),1,0,0); // ƒGƒ“ƒyƒŠƒEƒ€�Á–Õ
Use Notepad++, CTRL+F then Find in Files and put ",714"
With the comma, yeah.
Of course you'd have to put the correct directory
P.S. I have no idea in source coding.