Yeah, walkthroughs don't really exist for this one. There's only one for the original, which was obnoxious enough to english speakers (poor patch situation, difficult editor) that it lost it's support pretty fast. The faq for S2 is here
, but there ain't any for S3; sorry.
My advice (though having never attempted this cheat or actually having seen the bank mission yet, you might want to take it with a grain of salt) is to try to the best of your ability to recreate the exact conditions that STRYKER did in finding the exploit. Just turn it on when you go to dinner, put your squad in the right place, and come back in a 1/2 hour. Don't waste too much time on it, because you can make a lot of money just by finding the stuff that ISN'T hidden, like all the loot in the cave mission in the first set of missions (missle plans?).
Good luck, and please report back. Your country demands it.