How do I get back into the Confiscated Goods vault?

Question

I've been attempting to complete riddler challenges, and noticed that there are at least two collectibles inside TYGER's confiscated goods vault that I missed (map below). I've looked for a way in, but found the main door locked and the tunnel Catwoman used to enter entirely blocked off by Poison Ivy's plants. How the heck do I get back in there?

Answer 1

As it turns out, the riddler collectibles are not actually inside the vault. The solution to the riddle is

the door of the vault,

and the trophy is

on top of the building next to the vault.