Yes I found even more headsets in the boxes. These two are David Clark, stereo models, H-10-13S, one with a straight cord and one with a coiled cord, one bag for the two, both seem to have the comfort kit installed. $195 Each or $375 for the pair.

Sandia Aerospace digital altitude encoder Model SAE5-35 PN 305154-00, does both grey code and serial output, 11-32 volts good to 35,000' With mounting tray, install data available online. $225 (this makes wiring to the garmin 330 below a snap)

Garmin GTX-330 Mode S transponder. New in the box, no tray or connector kit. (tray and connector kit on ebay for $75) if you have a Garmin 327, it can be a replacement, with a backplate change. The pumpkin heads over at TSA are going to mandate mode S really soon, so the price will climb. It can also be upgraded to ADS B, the 330 ES flavor by Garmin for $1200. So you can get a jump on the 2020 deadline for that. $2,500. I'll throw in the installation manual (digital copy) as well.