probably you took somedays to surrender the phone. May be at first you thought to keep it with you but when someone advice then you surrender but during that time it's already reported to CID. For an example when you got the lost phone, the owner(The lady)must call from other number but in that time you didn't pick up the call & may be you switched off it. CID shouldn't catch you if they didn't find any intention from you to hide it. Now it's a matter of CID. So, only CID can remove this ban.