While trying to escape with the Declaration of Independence in his jacket, the lady asks Ben if he is trying to steal it and he then has to pay for. The clerk tells him the price of the Declaration of Independence is $35. This is a price we later see in the top right corner of copy of the Declaration of Independence when Ethan believes he stole the actual document and finds out otherwise. When in the van, Ben admits he had to use a credit card to buy both the Declaration of Independence and the copy version. He then says to Abigail Chase that she owes him $35 because he had to buy both the real and fake version, when in fact they were $35 by themselves. So in reality he should have said that she owed him $70.