I just bought a set of cameras in an auction, and in that set were a Rolleiflex that I really wanted. But when I picked it up, there was a lot of accessories included that where not listed in the auction itself. With these accessories where a plate adapter kit, with what looks like 3 film holders, a back for a Rolleicord / Rolleiflex, and a holder with a ground glass for focusing. Now, I have no experience with plate film or Rollei-anything, so this is a bit new to me. Can I even get film for these holders anymore? And is this something that's worth anything (i.e. should I mess around with it or just keep it in the box?)?