If the hops have been in nitrogen flushed, vacuum packed bags, then you have nothing to worry about.
If the bags have been opened and then resealed, then you have nothing to worry about.
If the bags have been opened and then resealed and left on the counter for 3 weeks, I would not worry about them.
The longer answer is that the oxidation of hop oils and volatilization of aromatic compounds relies on contact with oxygen and temperature. The hop storage index for hops is measured storing the hops at 20C (68F) in a closed container (note: not sealed nor under vacuum). When you change these factors (vacuum seal in bags that resist Oxygen permeation, stored under cold conditions) then you prolong the shelf life of the hops. I have had vacuum sealed hops in my freezer for several years with only a slight drop in potency of either bitterness or aroma.
Edit: Can't spell well this morning...