We'll never know. If he did, the liars at the Vatican who hate the TLM would be sure to bury his request under a pile of horse manure. "Burn those papers, Judas! We can't have Benedict's wishes known to the world. More people might turn to that cursed TLM!"
Louie Verrecchio has an interesting post on his blog, akaCatholic, The Hidden Testament of BXVI: More evidence. Check out the whole thing, but here's the relevant bit:In the present case, it is entirely reasonable to believe that BXVI did in fact express his wishes for a simple funeral, one that avoids the spectacle of Heads of State converging on Rome from around the world such as they did when JPII died.