You can always try, but the terms and conditions are quite specific, and states that anything purchased outside of the window does not qualify for the bonus...

However, in my purchase email, it states I have a 2 week "cooling off period", so maybe you have buyers remorse? :-)

Although, won't work if you have used them already, and there is no guarantee offer won't disappear after return... Worst case scanario, you buy them again with no bonus... or just buy some more (like my wife would say with shoes) :-)