I don't know why you think the USDA knows how many chickens there are in the USA. They might know how many chickens are in commercial farms, but there are a lot of folks that do not keep chickens for commercial purposes. There are even people that keep chickens secretly, indoors, because of a variety of reasons, such as recent efforts to register every chicken, even every parakeet, by the UK. So, the USDA does not know how many chickens there are in the USA.

Chickens do not lay an egg every day. If you keep them in environmentally controlled conditions under lights they will lay eggs most days, depending on breed. IME good breeds of chickens lay ~300 eggs a year. So those are things you can reconsider to try to come up with some kind of estimate of how many chickens there are in the US.

However, you make both these statments as facts:

"...according to department of agriculture official, 372 million chickens in the US."

"...there isn't hundreds of millions of chickens in the US..."

So, you contradict yourself, and clearly don't understand what you're talking about, or you're trying to mislead me. Either way, I can't take you seriously.

Honestly, reports from serious folks claiming to know are that more than 150M chickens were euthanized over 'bird flu'. So, despite everything I just said, and proved you wrong about, you're right that 150M, or any number south of 200M, isn't 'hundreds of millions' of chickens. It's close, but no cigar. Hoist by my own petard, I concede that you are right about my claim. It is slightly hyperbolic. It is close enough to being correct to properly convey the horrific culling that has produced the egg shortage.

Shortage of supply, just like massive demand, affects price. Egg prices are falling towards normalcy even now, as the earliest culled flocks have been replaced with new layers. I just saw a carton of eggs that had been purchased at my local market for $4.29, when just a week or so ago they were $8.29, and that was down from the high, which hit over $12, so I think the problem is resolved - in the short term.

The fact there was a problem at all, because government was trying to drum up a panic, is a long term problem that will not be easily resolved, but will take people rolling their own, and not just regarding eggs, but most of the goods and services they consume. When the vast majority of people produce the vast majority of products they consume, government will become irrelevant, because there will be nothing to tax. If people aren't buying what they need, then people won't be selling stuff to make money. That's how we solve the problem of tyranny: just make government irrelevant by making dependence obsolete and becoming economically independent. I am working on doing exactly that, and providing a template that folks can use to produce the majority of the goods they need to regularly purchase themselves instead.

Edit:

"The small and medium eggs, they said, weren't for retail sales. If they are not selling the small and medium eggs in the country anymore, where are they? You don't see them hardly anymore, once in awhile you see medium eggs but it's rare."

They are used commercially, for cake mixes and the like produced by factories.