We bought some eggs, well before their expiry date. 4 out of the dozen were bad. I called the business/farm that supplied the store, and left a polite message explaining that having 1/3 of a dozen eggs be off just would not do.
I just got off the phone with a rep from the company. She was glad that I called, asked me for my details, and the info on the egg carton (I saved it just for that purpose). I will be receiving a voucher for a dozen eggs. 🙂 She said they will have a rep stop in at the store where they were purchased and instruct them about rotating old stock out with a bit more alacrity.