Receptionist Glenda Norton said the plaster caught her eye because it was a strange thing to find stuck to the floor where a rug had been. Plenty of people had been into the office after the break-in but all had worn shoes and were unlikely to have shed a plaster.
She picked it up by one corner and popped it into an evidence bag, not expecting anything would come of it.
Bay of Islands SPCA manager John Logie commended the police for going as far as to forensic test a plaster. Future offenders could be deterred if they knew police were willing to investigate so thoroughly, he said.
Everyone at the SPCA was pleased the police had been able to bring someone to justice.
"We thought we were being clever sleuths by spotting the band-aid. We didn't think the police could take it to that level [of DNA testing]," Mr Logie said.
The Bay of Islands SPCA was also grateful for the outpouring of support after the burglaries. As well as messages and donations from around the country, a Waipapa business had donated a replacement TV for the raffle, and the Auckland branch of the SPCA had donated a 2006 Ford Transit van to replace their stolen truck. A staff member's stolen Queen's Jubilee medal has been replaced by the SPCA's national office.
Sonny Strongman is due in the Kaikohe District Court on January 24 charged with burgling the Bay of Islands SPCA. He faces a raft of other, unrelated charges for which he is due in court on February 5. His partner was also arrested and charged but on unrelated matters. The SPCA's Mazda Bongo truck, registration GRS676, is still missing. When stolen, it was navy blue with SPCA on the doors, bonnet and tailgate.