Found a few of these in my inventory and didn't have anyone to give them to. Steam description:

A Merry Payday Christmas Soundtrack is the fourth DLC pack and the second soundtrack for PAYDAY 2. This festive Christmas album is packed with no less than six seasonal hymns, written and produced by OVERKILL's own Simon Viklund and performed by Old Hoxton. Three Santa masks are added as well; continue heisting with the Furious, Tipsy or Surprised Santa masks and get into the proper Christmas spirit!