BEWARE second-hand child restraints. They may be tempting financially but older car seats present several safety risks. Experts recommend against using a car seat that is more than 10 years old.
Also look for cracks, splits and frayed straps and ask about the history of the seat. The seat should have a tag or sticker saying it meets AS/NZS 1754 (version 2000, 2004, 2010 and 2013). Ask for the instruction booklet.