Hi, first of all the drop from any type of box say box of luck box of kundun green ribbon box etc, are configured in muserver>data>eventitembag, in order to put the drops, you must localize the specific .txt of each box, the just put the index and type from item.txt.
2)Go to muserver>data>Message.txt find the one that says the message they currently say then change it.
3) This problem is frequently caused by antilag programmes, it is not from the server side but from the client side, just try disabling any type of antilag and download the full client again.