What is this black box in rear trunk near ECU?

[Porsche-Eh]

Originally Posted by rexcramer

Be careful of the flux capacitor.

Couple photos of the project with and w/o hardtop. Everything works except remote buttons and it won't crank. Smells like rfid pill or previously wet immobilizer but only more diagnosis will tell. Going to get a durametric or top of the line obd reader. Thanks for the help.