They are ไข่เค็ม /kài kem/ or salty eggs from Surat Thani’s Chaiya district where they are famed for their distinctly red yolks and having the right balance of saltiness. ไข่เค็ม /kài kem/ are traditionally made with duck eggs because they are slightly larger than chicken eggs, and they have a bigger yolk.
The text printed on the box is the information that specifies the date until which the eggs can be fried, after which they are recommended to be boiled only. When you rinse the soil harvested from termite mounds (ดินจอมปลวก din jom bpluak) off you will see the beautiful clean white eggs inside.