I used to put fliers on bank employee's car windows, saying I wanted to buy any "odd" notes they came across. Didn't amount to much. Unless you count the 1934 $5 FRN, LGS, SN# K00001004* (Fr. 1955K*) I got for $12.
That's crazy. I have never met a teller that would do this for me. I think I sort of tip them off to the splendor of coin collecting, and then it's game over for handouts. ~JobIII