You may need assistance from your vacation guide. As long as you have paid your deposit and signed the initial paperwork, you should be able to make a reservation- even before closing.
I sent my deposit in, and in about 1 1/2 weeks, i received all the papers via fed-ex, along with a couple surprises in the box!! In the group of papers and member handbook, enclosed was our membership numbers. I have made my res for next yearl already, and i just returned all the papers to them via fed-ex yesterday. I hope mine goes through ok!!
Give your guide a call tomorrow, you should be in the computer by then and he/she should be able to get your membership number. If you not, it will give them a little push to get you in!!!