Scripts

It's slightly easier during activation to save the current date in a variable and, when the object is touched, compare the date with that variable. If the behavior is the same for all players, there is one variable; if it's different for each player, there is a table of variables.
If you need to visually indicate on the object whether it has been looted or has already been refreshed, then you can only do this through a trigger for the new day; there are no other ways.