Stolen Amp Help!!!

[Six Pot]

Afternoon,

I just bought a 2011 M3 Coupe that had aftermarket system in it that was stolen. From the looks of it they stole the aftermarket amp and the OEM rear amp. So here are my questions:

1) Car has these options based on VIN decoder:
609 Navigation System Professional
645 Radio Control Us
655 Satellite Radio
676 Hifi Loudspeaker System
2) With the AMP missing nothing is working including CIC screen. Normal? System was fine pre-theft, no other damage other than AMP gone.
3) What Amp do I need and does it need to be coded or a used one can just plug in?

When I do a search on Hifi amps I found this , pin out seems right:
https://www.ebay.com/itm/11375718520...61abce712f0758

Picture of missing AMP attached. Any advice appreciated!