How does Van Dusen tease and taunt the warden in The Problem of Cell 13?

Van Dusen, or the Thinking Man, both plans out his strategy in advance and takes advantage of serendipitous occurrences that he can adapt to the plan. He enters the prison with a list of specific requests; the warden is irritated but sees no reason not to comply. These requests including having his shoes polished and being given tooth power and 25 dollars in specific denominations. Each day, however, a few events get under the warden’s skin. Van Dusen starts giving out or dropping notes, even out of his windows. The warden cannot figure out where the paper came from. Van Dusen writes on the white cloth of his shirt, which the warden then removes; nevertheless, he still finds linen to write on. The warden also cannot figure out what he is using for pen and ink, as he entered the cell without them. He also gives out money in different denominations than the ones he had taken into Cell 13 Frustrated, the warden has his cell searched but all they find is a dead rat.