IOUS

IOUS are the fake money and they are taped with nuts which Lloyd and Harry put them in the briefcase and which Surly isn't concerned of.

History
When Nicholas Andre  is looking through the briefcase with the money he was suppose to get from the Swanson family when Mary came to Oakton City and before Surly is captured. Instead he finds only IOUS taped with nuts in the case that were put in there by Lloyd and Harry so they can show how good of people they are.

In the 2nd crossover movie, IOUS are mentioned by Lloyd and Harry at the Mayor Muldoon's house.