The expert, who specialises in shoe marks, said she examined the prints that were found in Mrs Allen's Boonal Street, Singleton, home and was able to identify them as coming from a pair of Asics Gel Nimbus between the sizes 9 1/2 to 12.
She said some of the prints were an almost identical match, but without unique features such as cuts or other markings she could not say whether Mr O'Heir's size 11s left the prints.
Mr O'Heir, 28, has pleaded not guilty to the robbery and murder of Mrs Allen on March 1, 2009.
The trial heard from two police officers who stopped and spoke to Mr O'Heir and his girlfriend, Cheyenne Anderson, on the night Mrs Allen was killed.
The officers said the couple were behaving suspiciously and gave their names as Jessica Girvan and John Cox before the officers drove them to their George Street home to allow them to provide identification.
The couple went inside and left via the front door while the two officers waited at the back door, the court heard.
Two days later, police searched the George Street home and found two backpacks containing personal papers and other items that belonged to Mrs Allen and clothing in a hidden compartment below the floorboards.
A fingerprint expert told the jury that Mr O'Heir's prints were found on a number of items bearing Mrs Allen's name while Ms Anderson's prints were found on items including a torn envelope that had Mrs Allen's name on it.
The trial before Justice Michael Adams continues.