Thanks everyone.
As a first step I ordered this endoscope:
The endoscope comes with a little magnet attachment. Seems like a good thing to have anyway. Should arrive this weekend. Once I get it I will first scope down the port, who knows there’s a small chance the piece is still there somewhere accessible.
Until then I will refrain from disturbing anything, just in case the piece is still precariously hanging somewhere accessible.
I’ll post any progress…