It turns out the nest contained two of the tiniest eggs he had ever seen! This man has a YouTube channel called A Chick Called Albert that documents his adventures raising various feathered fowl, so he's quite familiar with nurturing eggs in his incubator.
The birds eggs he found were from a wren, which is in the second smallest bird species in the world, the man disclosed in his video below. But he wasn't even sure if the eggs contained baby birds.
So the man took them home and placed them in a plastic container in his incubator to warm them up and try to save any babies that might be in the pearl-white eggs. He turned the eggs three times a day to ensure proper development of a possible embryo.
After that, he held the thin-shelled eggs above the light on his cell phone in a darkened room to see if there were any signs of life. One egg was empty -- no baby.
But the second egg showed movement! There was indeed a baby in that egg.
It dawned on him that he could pluck lice from the roses in his garden and tenderly feed them to the baby bird with a teeny tiny tool that would navigate gently into the baby bird's itty bitty mouth. He missed the bird's beak the first few times, but eventually he succeeded!
The baby bird was starving and snarfed up the bugs. But then it was hungry just 10 minutes later!
The man fed the baby bird every 10 minutes for a total of 80 feedings every single day. He missed one feeding and the poor delicate baby bird almost perished.
He had to find other sources of food that the minscule bird could handle. Then he realized the bird could not gain its footing in the slick plastic container either, so he gingerly picked up the baby, which was the size of his thumbnail, and it settled down in the warmth of the palm of his hand.
After padding the plastic nest, the bird was gently placed back in its plastic nest and it settled down momentarily, only to open up its beak and beg for more food. The man was stunned that it only took a couple of days for the baby bird to sprout all of its feathers and stand on its own.