The exact identity for the ware for April 2013 remains a mystery.
Consensus confirms it as military hardware, and the string “54497 ASSY 1733D2434” on the top identifies it as being made by Martin-Marietta (every US military vendor has a 5-digit code, and 54497 is that for Martin-Marietta, which was an independent company prior to its acquisition by Lokheed-Martin). The connectors identify it as a VME module of some sort. I particularly liked wam’s thought that the triplicate chips could correspond to the three-axis data processing that happens in an IMU. For that, I’ll give wam the prize — email me to clam it!