She suspiciously paid for everything in cash for years, then people realized why
Cash Only
It did not take long before Anna Delvey became known for her generous $100 tips at the 11 Howard hotel. “People would fight to take her packages upstairs,” Neff explained, “Fight, because you knew you were getting $100.”
Anna was aware that money sometimes spoke louder than words, so she always had $100 bills on hand. In fact, she only ever with $100 bills in cash. A behavior that would later be used as a clue.