i did not found anything exactly about this searching, so i know everybody says that l2hpx can not do anything special especially on l2off servers, but i kind found a bug with a GMSHOP  , and i was trying to do a request buy item, but it does not work, because the list id( object id) always change every time that i buy the same item so i can't know exacly the list id to do a resquest buy item :\ 
for example: 
  
1F 44 D4 74 D8 01 00 00 00 6D 0F 00 00 01 00 00 00  
1F 44 C8 79 DB 01 00 00 00 6D 0F 00 00 01 00 00 00  
1F 44 34 3E D7 01 00 00 00 6D 0F 00 00 01 00 00 00  
  
this is a packet to buy Blessed Spiritshot: C Grade at mr . cat GMSHOP( **yeah this gm shop isn't supposed to sell any item just for change 2nd and 3rd jobs, but i found a way to open a shop with an action and (Command: menu_select)  from another trader NPC and then i can buy some crafted items**)    
  
3 times that i tried to buy it has changed. 
my question is if is possible to know the right numbers of the next List Id, or not ? 
i tried to do some math's but i did not figured out by my self. 
  
sorry for my bad english, i will study harder i promisse ;D  
thnx.