Despite having been stolen nearly two weeks, missing Great Moscow Circus clown Boris has turned up unharmed, but slightly muddy, at a construction site in North Orange.

Circus general manger Greg Hall said whoever took Boris must had decided to play a prank on builders by inflating him in the front yard of the residential site on Wednesday night.

Boris was last seen in the yard of a Gardiner Road house at around 1am on Saturday, June 14 where he'd been placed to help promote the circus' visit to Orange.

Mr Hall said he has no idea where Boris has been all this time but he's pleased to have him back.

"He's up, he's inflated and he's fine," Mr Hall said.

"He's a bit muddy, a but dirty but I'm just really happy."

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Mr Hall said he would give Boris "a day off" while he's washed before inflating him until the circus leaves Orange on Monday morning.

"I didn't want to leave Orange without him, it would have left a stick in my throat," Mr Hall said.

Brandon Sullivan was the first worker to arrive at the site and admits he was surprised to see Boris' smiling face.

"I thought, this is a bit odd," he said.

Mr Sullivan's workmates arrived a short time later and the men had a laugh before calling the local radio station and police.

Mr Hall had previously offered a $500 reward for Boris' return and gave it to workers at the site who promptly decided to donate it to the children's charity Give Me Five For Kids.

tracey.prisk@fairfaxmedia.com.au