The population of the fairly new United States in 1800 was approximately 5.3 million people, and at least half of them were armed. The majority of them were armed with smoothbore military weapons, and inexpensive fowlers, not the more expensive rifles. The average lifespan of one of those guns was only 2-3 years. They got used up; worn out; broken; blown up; lost in lakes, rivers, & oceans; and the salvageable parts utilized to build new guns. Nothing useable was thrown away.
What survives today are those weapons that were put away & forgotten; treasured as family heirlooms; lost, and then found; stored away by governments, never to be used as newer technology came along; collected by those wealthy enough to do so; and those donated to museums.
These surviving guns are but a tiny fraction of the totality of the flintlock and percussion weapons that were imported/smuggled into the colonies, imported/smuggled into the United States, or manufactured here in the United States.
I think I recall reading that approximately 25,000-30,000 Carolina Trade guns were shipped to the southern colonies over a 30-40 year period in the early 18th Century. But, there is NOT ONE COMPLETE surviving example of one of these guns.