Do speakers need to be re-broken in?

Just purchased a set of speakers which have sat for quite while- 5 years from what I am told. I have heard the differences between new "tight" speakers drivers and a broken in pair, where the bass gets deeper and the speaker "breathes" better and sounds more open, and clear and resolves better, you know- just sounds better all-around.

I haven’t witnessed this personally in my own home in over a decade, and that was with planar drivers and not conventional cones, which this set has, but regardless of speaker technology I believe it is well understood this is a necessary process and manufacturers agree and suggest this- so not looking for any arguments there please.

But I would think used, or already broken in speakers would not do go through this process, but my ears are telling me they are getting better, so contrary to my assumption perhaps they do need re-breaking in? Anyone else gone through this?