Just to be clear, the code on the late arrival sheet was wrong, which is what the problem was. I didn't use the same code at both locations. I first went to pick up my packet at the main location, which was no problem, then went to the annex and tried to use the code written on the sheet which was wrong. I detailed this on the voicemail I left that night.
I do appreciate you all letting me leave my bags there, but when I asked, they said that the do in fact often let guests leave bags if they have a later departure.