I have just purchased a new P2S directly from Bambu. During the unboxing and when starting the calibration the bed went up and I saw a yellow filament poo at the bottom. Is this a reused printer? A returned one?
Welcome.
There is a good chance that the unit has been returned and resold.
There is a better chance that they had to do maintenance on the unit before it was shipped out and were not careful cleaning up.
Or…It’s just from QC.
If i recall correctly if you buy a nozzle from bambu it also has leftover filament in it.
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I also think they test some if not all before shipping.
Snapmaker say they are testing every single U1 they will ship.
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I had an identical poo in my new p2s. I don’t think it’s a return.
After 2 months using it I have to say it’s been long forgotten 
The printer works perfectly and delivers superb quality with minimum effort/adjustments.
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mine came with one too and all nozzles had filament inside. it makes me feel safe that bambu. tests all of their products