[edit in 2016: I have sent/received no boxes in the pat 5 years and should take my name off the TGIMBOE list.]
Received another TGIMBOEJ last week, and while I forgot to take photos I can at least write down what I took out and put in.
But first, a warning out adding stuff to a TGIMBOEJ box: If you add electronic components, especially tiny ones like caps or resistors, make sure they are in a sturdy bag. Two of the DC motors in this box have a collection of tiny components stuck to the coils and will probably need some cleaning/debugging to get working again.
What I took out: peristaltic pump and some end stop sensors
What I put in: printer power supply, bunch of gears, a couple of motors, lots of machine screws, some cables, and some other random bits from a printer I tore down. I also reboxed it into a new box and bagged up as many of the components as possible.