my knee jerk reaction was that those prices are really really high for used beginner gear..
So, a quick check at ebay sold listings have a yamaha rbx270 sold for $80 and a line 6 LD15 for $65
you can do far better for far less money.
as far as played or not.. plug it in, turn every knob and make sure things work and no scratchy sounds, and budget $20 for new strings...but 4yo is irrelevant.
Genz-Benz #429, G&L #502, Ibanez #1034, Mediocre Bassist #883
Genz-Benz Streamliner 900 & Uber Quad, TC BG250