Ask a perfumer what separates a great composition from a good one and you will rarely hear about rare absolutes. You will hear about restraint: the discipline to remove an ingredient that is pleasant but unnecessary.
Chanel N°5 is the canonical example. Its genius is not the aldehydes — others had used them — but the proportion, an overdose of jasmine held in check by a dry sandalwood base.
Which is why we verify batch and fill level rather than relying on the box. A fragrance is a living formula; the same name can smell subtly different between years, and collectors care about the difference.