MANILA - Senate Committee on Banks, Financial Institutions and Currencies Chairman Chiz Escudero on Monday asked the Bangko Sentral ng Pilipinas (BSP) to submit a complete report on the "faceless bills" incident last December.

Bangko Sentral ng Pilipinas Director for Banknotes and Securities Printing Department Mary Anne Lim estimated that about 50 faceless bills went out in circulation, 32 of which have been returned and are being investigated.

• Read: BPI probes 'faceless' bills allegedly withdrawn from ATM

There could be P50 and P100 denominations still in circulation, she said.

"So far, we have not received complaints for P1000. There was a report for P500, but it was not returned, so we cannot investigate," Lim said.

The BSP has 4 lines that can produce 9,000 bills in any given hour, Lim added.

Escudero said he plans to do an on-site inspection of the printing facility.

Last December, reports of faceless P100 bills went viral on Facebook.

The BSP earlier said a "rare misprint" caused a "very minimal" amount of peso bills to be released with missing face designs.

• Read: 'Faceless' bills due to 'rare misprint,' Bangko Sentral says