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Far from massive
The date on the box assumes a two year shelf life, this is a US standard that almost any medicine will keep for so it simplifies individual testing of compounds for actual shelf life. That said AAS particularly CYP will keep 5 years no problem as long as its kept out of sunlight at a steady temp of 60°-80°f and moisture and pressure are kept at normal levels.
By the way storing in the bathroom will not be a problem short term, but its the worst location in the house as moisture will of course migrate through a septum to some extent and the bathroom has the highest moisture of any room in the house.