I am pretty sure that I dropped a dvd that was ove...

I am pretty sure that I dropped a dvd that was overdue into the drop box, before I entered the library entrance. I went to the check out desk to pay for an overdue fee of one day and the check out lady went to see if the dvd had been returned in the slot. She checked the slot and came back to say it wasn't returned and she couldn't find it. She checked all the other slots and it wasn't found in them. It doesn't just disappear into thin air magically! So she ended up writing up a yellow card and would pass it on to her co worker to figure out the problem. Certain employees that work there are so incompetent. I guess I won't be paying the overdue fee until they find the dvd I returned.