Safty Reminder:
Please deposit your valuables in the safety box.
Call the Reception when you need the service.
酒店之类场所用语非常正规：
安全提示：safety reminder.是提示而不是通知.
存放：deposit正规用语请看下面的解释.
deposit的意思：To give over or entrust for safekeeping.
托付,寄存：委托保管,托付
贵重物品用一个常用单词：valuables