In an email sent to Woodford Folk Festival ticketholders on Wednesday afternoon, festival executive director Bill Hauritz said some had not redeemed their so-called "wristpos" credit upon leaving Woodfordia.

The wristbands were a new addition to the 2016 festival, which came to a close on the weekend, and were not without their detractors as the festival got into gear last week.

"We'd hoped everyone would do this but a few of the deposits are larger than we expected and not just 'loose change', as was the case with the former drink tickets currency," Mr Hauritz said in the email.

"While it's an extra burden on our administrative staff, we felt the figure was too high so in the last few days we've worked with the RFID company to create a portal which will enable you to access any unused funds."

People with outstanding credits were asked to go to a New Zealand-based website and type in the unique code on their wristband to access refunds.

The portal would be open until midnight on Sunday, January 15, Mr Hauritz said, and refunds would be processed in bulk on Friday, January 20.

But there was bad news for those who did not keep their wristbands.

"We understand that many of you might have disposed of your wristband by now," Mr Hauritz said.

"If this is the case then unfortunately there is no means of accessing any unused credit."

Mr Hauritz said unclaimed funds would be handed to Woodfordia Inc, which owned and managed the festival.

"(That money) will go towards the building of a large shade house for all our plants along with a propagation area for new seedlings to help re-vegetate Woodfordia," he said.

"We're aiming to achieve that this year."

A festival spokeswoman said she was unable to say how much money had been left unused by festival-goers, so it was unclear how many people were left out of pocket and by how much.