Yes, it can. But it's in the best interest of the Testator to make sure that someone knows about the will. If not, the person can be presumed to have died intestate, and the Estate can be handled in that manner.
Everyone knew a soon as it was discovered. Her death was not kept secret.
President Wilson had a stroke. It was kept a secret.
Very few people even knew about Terezin until the 1990's, why was Terezin's story kept a secret for so long?
I believe it was Peter Chamberlain who invented the forceps between 1540 and 1596. But the invention was kept secret until 1813.
His favorite meatball sandwich shop
They aren’t kept secret.
George Marshall like to collect toy and little soldiers as well as artilleries and tanks. He was very keen of his collections. His collection was very well kept in secret up until his death.
Copernicus kept his work on the heliocentric model of the solar system secret because it challenged the widely accepted geocentric model supported by the church and prominent scholars of his time. He may have feared backlash, controversy, or persecution for presenting a theory that contradicted existing beliefs.
His favorite meatball-sandwich shop
Yes, they knew, but they kept it a secret until it was too late.
Shah Jahan was kept in the confinement for eight years; from 1658 until his death in 1666.
James Marshall kept it a secret until someone found out.