Unfortunately there have been instances where people have threatened others with replica guns. As usual it's always a stupid minority who have to go and ruin it for everyone else.
25/7/1994 = replica pistol used to hold up clerk taking business takings to bank.
11/12/1995 = replica pistol used to rob bank taking $5650
1999 = 2 co-offenders entered video shop wearing balaclavas. Pointed replica pistol at victim and demanded money. $600 plus money and credit card taken.
15/5/2002 = pointed replica gun at 17 year old schoolboy and searched schoolbag for mobile phone
30/11/2004 = Replica pistol used to rob manager of club with co-offender, three employees bound, video tapes removed and $81,000 stolen
30/8/2005 = Replica gun used by gang who entered an elderly couple's home and stole the woman's handbag
...and these are just the more serious criminal offences. There would be lots more examples of minor offences involving replica firearms too.