the options part of the contract has changed since 2000. did you finished IOE? if not you might not have been considered as succesfully finished training, so you got no options. ubs should have send you an information package with you account, if not, you got no options. the price of the options is set by the board, if you quit before the board sets the price and # of options you might be out of luck too. also , options now are vested over a 5 year period, your 2000 contract was different, but even if it said "inmediatly vested", there is a definition of inmediatly that has a time frame and cetain conditions .
contact JB HR and ask for a copy of you contract then have a lawyer look at it.
remeber too that options might not only expired if you quit, but you have a statue of limitations to put a claim on the value of those options if the company dropped the ball and is liable, so time is of essence.
good luck, those year 2000 options are worth some good $$$.