I went ahead and wrapped the chucks in two layers of parchment paper. I don't think it will work for the brisket as it is a big brisket and the parchment paper isn't wide enough. I might try the butcher paper. It does say "SAFE FOR FOOD." but it is definitely sold there as something to color or draw on. I couldn't find butcher paper anywhere else locally, but didn't go to restaurant supply.. it is on the other side of town.
GOSM Wide Body
UDS and another on the way