I accidently broke a necklace at a store once and put it back like nothing happened
Did you still feel remorse after breaking the necklace?
Yes, I felt really remorseful and guilty.
It is customary to inform someone at the store than a product is broken. It is wrong to cover up a mistake when it could harm someone else.
WTF, I'm not responsible for the staff.
You are responsible for the necklace since you broke it. The staff would want to know why the necklace was broken in the first place.