I haven't used the day use fee boxes in years, but there was an out of state guy trying to put in at North Graysport Sunday, and he asked me about it. He said there were no envelopes in the box. However, when I put in at South Graysport yesterday, I saw a guy filling an envelope out. Apparently that box had them. Long story short, I don't know. I've been buying the annual pass for years..
*The reason for no envelopes at North Graysport may have been due to the fact that ramp has been unusable during the drawdown.