The terms and conditions do state that there is no credit for hotel stays made prior to enrollment.

But if you contact a CSR and ask nicely, they'll--probably--take receipts up to one year old, as long as the receipts were otherwise eligible.

Make sure your receipts have:

1 - Your name.
2 - Your itemized charges.
3 - The hotel name.
4 - Write in your account number.

I'm so tired of missing hotel stay requests. I've memorized the US fax number. 1-801-468-4033.

If the CSR doesn't offer to take them, hang up, call again, and ask the next CSR.