Stop in for a cup of coffee

Too bad you didn’t keep it, they are valuable these days. They can be worth anywhere between $600 to over $1,500 apiece with an average worth of about a 40% premium to the bill's face value. Rare ones can go as high as $10,000.
Who can tell me what is on the back of a 500 and 1000 dollar bill. Dont google it!!!:lol: