We can probably subtract ZG from that picture. Casey didn't look at the Sawgrass apartment in ZG's name. ZG made her statement to LE and it was in fact herself that looked at the apartment.
I think, even if Casey showed up at Sawgrass to inquire about an apartment during the same time ZG happened to be there, I'd think she would just swipe the visitor card instead of taking information from it.
I see. Thanks for the date guys. Sometimes I get all this information mixed up!