Grant then ran off, and was chased by witnesses before he was apprehended by police.
It wasn't the only time Grant had tried to swap someone else's vehicle at a sales yard, according to another of the 13 charges before the court, which Judge Bridget Mackintosh, who sentenced Grant on Wednesday, said had spanned five separate series' of offending.
She was told Grant had been an inmate at Manawatu Prison in September 2018, and was given permission by a fellow inmate to stay at a Woodville address on release and to use a car at the address "until he got on his feet".
While the owner was still incarcerated Grant traded the vehicle for another for his own use, claiming later to police he was "given" the vehicle and that he had the paperwork to prove it.
Earlier in the day of the Napier vehicle theft, Grant had also unlawfully entered a home in Nuffield Ave, Marewa, while other offences included being unlawfully on a property in nearby Savage Cr early on the morning of January 20 this year.
In court, Grant was leaning on crutches, having broken his leg while on remand in jail – an injury that defence counsel Philip Jensen said was "substantial."
The cause was not revealed.
Grant had pleaded guilty to one charge of burglary, three of being unlawfully on property, four of converting, unlawfully taking, unlawfully interfering with or theft from motor vehicles, two of shoplifting, and one each of possessing methamphetamine, wilful damage, and dangerous driving.
Saying Grant had time to rethink his life while in jail on remand, lawyer Jensen expected Grant would be able to soon be able to be released and to undertake treatment in the community.
Grant was sentenced to 20 months in prison, with time-served expected to be taken into account. He was also disqualified from driving for nine months.
Judge Mackintosh also set conditions of release extending six months past expiry of the sentence, and ordered Grant to pay reparation for damage and losses resulting from the offences with the vehicles.