Well, which dumpster and which landfill? Meaning, from my understanding of landfills (Dad used to work for WM), different communities and different neighborhoods, different stores, are hauled by different companies, different days, etc. Items can be/are compacted and tossed in assigned areas per day of the week, hauler, etc. Not all companies use the same landfill. (private/public?)
In other words, needle in a haystack. Could be needle in two or three haystacks depending on if he drove to a different county. Didn't he have more than two hours between driving off with Cherish and being pulled over by police?
Here's a list of possible dumps/landfills/transfer stations
http://www.yellowpages.com/jacksonville-fl/landfills