No – that makes no sense.
If you don’t know something is there, how would you know you have to cast a spell to reveal it?
Surely you can only cast a spell on something you know is there to make it visible, not on something you don’t know is there.
Because if you don’t know it is there, how would you know it is there to cast a spell on it?
You don’t have to answer this, but just how many eggs have you had to go through to find these five?