With keen observation I have come to notice the gradual withdrawal of #50,#20,#10 and #5 from circulation. I dont know if this is a localized issue based on my state of residence or a nationwide trait. My observation is based on the scarcity of this lower denominations in everyday business transactions. I think Sanusi is this time unannounced and gradually carrying out his shed plans of archiving these notes and perhaps coming up with the introduction of #5000 note.