How in the world did you get five? From what I was told, you only get one voucher per reservation. Last year, we received two coupons for a free Planet Hollywood souvenier. Had to go twice to get both items.
Did you purchase these vouchers, or were they part of a package? When I purchased our WDW Tickets through Undercover Tourist I also bought 4 $10 Vouchers (one for each person in our party) that also guaranteed front of the line privilege at Planet Hollywood. I was able to use all 4 together. But like I said, these were purchased vouchers.
When we reserved our 2 rooms & purchased 6 day PH passes we got a 6 day fun & more pass (per person) 5 free rounds of miniature golf & the 5-$15 planet hollywood vouchers.
I guess it was a special they were having for the times we booked