I was just reading an old article from an 1891 American Philatelist by E.B. Sterling describing how he and Deats obtained and cataloged eight boxcar loads of revenue material from the U.S. Treasury. Fascinating story!
Deats and Sterling sold off the remainders to collectors and some eventually went to pulp paper mills. Here's an example of a giveaway item they created as a promotion at the 1891 Great Interstate Fair in New Jersey. They printed 50,000 of these, which may give you some idea how much material they had on hand.