I recently received a letter from Amex which said that if I opened a Gold Account, the annual fee would be waived for the 1st year and I would get 25,000 Membership Rewards points if I spent $1,000.00 by October 31,2008. It sounded good so I applied for the card, received it and am now using it.
No problem.

In today's mail, i received a letter from Hilton informing me that in conjunction with the Amex Gold card, Hilton has created an account for me and, based on my use of the Amex Gold card, I now have over 12,000 Hilton HHonors points.

An added, unexpected plus.

I am, however, already an Hilton HHonors member and have an account with 67,000+ points.

My question for you Hilton Experts: Do I risk losing the 12,000+ points by informing Hilton of the 2nd account? Would they merge the two accounts and permit me to keep the 12,000+ points? Should I keep two separate accounts? What are the downsides of keeping two accounts? What would you do?

In advance, I thank you for taking the time to answer these questions (I did a search but came up with nothing).