A photo of young Josh sitting in his buggy at the beach accompanied the post.
By yesterday, the buggy had been found and returned to a very grateful owner - after an eagle-eyed member of the public spotted it.
'A happy boy today'
The Eastern District Police shared a photo of Lammas sitting in the buggy in front of the local police station after it was found.
"A fantastic community effort was made to recover this custom-made wheelchair.
"The owner made a public appeal on [Facebook)] which was picked up by a concerned citizen who noticed the chair at a property.
"Hastings Police located the chair; which was returned to their happy owners."
Lammas took to Facebook to thank members of the public who had helped to look for the wheelchair - including people from around the country who had reached out wanting to donate to buy a new one for Josh.
"We have one very happy boy today," she wrote.
"We couldn't be any more blessed. I was blown away with the love and support I received from my post. We are very lucky to get the buggy back in one piece."
Lammas' latest update includes a heart-warming message from Josh, sitting in his buggy.
"Thank you. Merry Christmas."