Since it sells for around $500, if the product is in very good condition, sell it for $400-$450. If the product is in good/average condition, then sell it for $300-$400. If the phone is in poor/ok condition, then sell it for $200-$300. And if the product is in really bad/bad condition, sell it for $50-$200.
since its R4000 and it dsnt have a problem you should probably sell it R2500 or if it has a problem go down like R2000-R1800 according 2 how much the problem is