The only way to now find this cache is to find the keys to the bank, a TB that will be roaming (hopefully!) around the local area. You need to find The Key to the Bank and note the co-ordinates - please note, you do not actually need the key!
This is The Bank, but it's not at the listed co-ordinates. Well, there is a bank at the listed co-ordinates, but it's not the one you're looking for!
Go to tbbankjob.wordpress.com for details.