What is the ruling for people who find out late about the appearance of the moon of Dhu al-Hijjah?

Someone asked [Hazrat Amirul Momineen, Khalifatul Masih V^aa] what the ruling was for people of a certain area who found out late about the appearance of the moon of Dhul-Hijjah. 

Huzoor^aa, in a letter dated 11 August 2020, gave the following guidance:

“[…] On the other hand, if the people of a certain area did not realise the rising of the moon of Dhul-Hijjah on [the night of] 29 Dhul-Qa‘dah, and found out about it a couple of days later, then they are bound by this command of the Holy Prophet^sa only from the time when they realise the appearance of the moon.”