I don't believe I had the option. I just filed my claim, and several years later a check showed up.
Hm no, at some point you were asked whether you want USD or BTC, plus (later) whether you want it guaranteed now or whether you want to wait for more.
That's what I remember, anyway.
Perhaps you should log in and verify. Maybe you missed the step about setting up an account on an exchange to get it transferred.
There was quite a few steps...maybe you still have something coming.