I have a P20+ MFDB for the Phase/Mamiya mount that includes everything - cables, P1 Capture disc, masks, cleaning pads, black Peli/Phase case, etc. and an extra brand new Phase battery.
It was purchased at Samy's LA, has only 3385 clicks and is mint- condition. No issues. Not many P20+s were produced so let's start at $5800 but I'm open to serious offers.