"It's just one of those things that is always there so it can take time to notice it.
"A staff member noticed it missing, we can't identify when it was taken yet. We are just going through all the CCTV footage at the moment."
The carving was taken from the saloon of the vessel where it was placed when the boat was relaunched in 2000.
Pollero was frustrated as to why someone would take it.
"It is very disappointing to have it taken from us. It's precious to us and we want it back. We are hoping the public can help us recover the piece."
Anyone with any information regarding the missing taonga is asked to contact the Whanganui Riverboat Centre on 06 347 1863.