Here is the reply I got. (FYI, its my second Plat)
I understand your interest in getting the best welcome bonus offer available for your new Platinum Card.
I confirm that your Platinum Card was issued with a welcome offer for 50,000 bonus points when you spend $1,000.00 in the first three months. As long as you've met this spend level by the end of June, your bonus points will be issued within 6-8 weeks afterward.
I reviewed our promotional offers and found that there are no active offers for 100,000 points at this time. The offer for bonus code 3882 was valid from April 19, 2010 through July 19, 2010 and is no longer available.
We value your membership and it's been my pleasure to help you.