Does anyone know if the Hive lash lift sachets have an expiry? I have just bought a kit and there is a number at the bottom with EX11.22 on it. I called the salon supplier i issued it from and they said the sachets do not have an expiry. They only expire once open. Is this the case? I have some old sachets i thought had expired (EX11.20) and not sure if i should use them??