I have 4 (100 dollar bills) that have markings on that have different markings, I'm sorry I really don't know how to explain them. 1. One has a UG* on the back 2. One has a what looks like the word "TELLER" 3. Two of them has a unknown marking Can someone help me I know some bills have star notes but usually after numbers and not letters. All of the markings are on the back of the bills.
When a note is in circulation, there are a lot of opportunities for it's recipients to stamp it. Typically, bank tellers, moneychangers in foreign countries, and even a business may stamp a banknote (usually for authentication). These markings did not originate at the BEP.
I agree with Legomaster1, many foreign banks use these 'chop marks" to verify that a bill is genuine. You typically find these marks on the $50 and $100 bills.
The types marks you are showing are not BEP ink marks. They have all been stamped into the bill after it was placed in circulation. Therefore it is considered damaged so spend them.
There are people in the world who collect almost anything you can think of. I do know someone who collects US paper money with these bank marks (granted some might not be bank marks on the op's note).
