Sure, roddennberry lent it to the motion picture set guys and it was never returned even with gene asking for it directly. No 0 one misplaces ≈50lbs of wood that's 3ft long and has specific storage requirements.

Historians, like model-maker David Shaw, who wrote a detailed history of the lost 3-foot model, believe that for at least a time, the model sat on Roddenberry's desk and was his property. They believe Roddenberry loaned it to people working on the production of Star Trek: The Motion Picture, but it was never returned. There is even a record of Roddenberry writing to contacts at the production house inquiring to get it back to no avail.

https://www.google.com/amp/s/arstechnica.com/culture/2023/11/after-decades-lost-star-treks-original-enterprise-model-may-have-been-found/amp/

Ed: off work. And yes it was actually reported stolen.

https://www.therpf.com/forums/threads/red-alert-lost-3-ft-tos-enterprise-found.354596/

Ed: estimated value given current sales of available studio models. ≈3 million+