http://www.redbook.com.au/used-cars/detail...id=12349D8084A5 Above is based on 40,000 - 70,000kms, so your's with >90,000kms would be $20k or under imo to sell in a reasonable time frame.
Bought mine off a reputable seller (injectors online) so would hope they are doing the right thing? Also, have heard that the china knock offs are hard to tune with & mine weren't...
Maybe call the police station & ask them what the general rule of thumb is with testing times? Don't let them know you have just been done or give them your name, just make a general enquiry. Cheaper then meeting with a lawyer to find out the same info