I think if you've sold two already and didn't miss them, then you'll probably not miss your other two either.
Why not, if you have the time, test yourself by hiding them away for a while?
If you find yourself forgetting all about them in a few weeks, you can probably safely get rid of them. If on the other hand you wish you could go use them again, then you probably shouldn't sell.
That's the point I'm at with some of my old bags. I found some old bags I haven't used in years, but don't want to sell them. :shame: I'll never really use them anyway though, so I'm going to ebay them. (they're not Chloes, just highstreet brands).