A dusty stash of works by famous Australian artists found under a bed during a drug raid at a western Sydney home are understood to be worthless.

One of the 16 drawings found at a house in Ellam Drive, Seven Hills about 10.50am yesterday is understood to have been a poster bought from the Norman Lindsay Gallery, while the others were pages torn out from a book and framed.

Detectives initially believed they could be real.

Blacktown crime manager Detective Inspector Ian Woodward said some of the Norman Lindsay images were nudes, while another was a drawing of his well-known Magic Pudding characters.

"I'm certainly no painting expert - they were a little bit dusty and they're in old wooden frames," he said.

A framed painting believed to be by Pro Hart and another unidentified artwork were also found at the home.

But the art is worth nothing. Had they been originals, it would have been a different story.

Timothy Abdallah, national head of art for Menzies Auctioneers, said Lindsay's nudes could fetch between $2000 and $6000, while a good Magic Pudding drawing could sell for as much as $10,000.

Mr Abdallah said Pro Hart's most elaborate paintings had sold for about $20,000 and attracted particularly high bids after his death in 2006.

Following yesterday's raid, during which police also seized jewellery, electrical appliances and small amounts of substances believed to be heroin and cannabis, a 51-year-old man and a 34-year-old woman were charged with a number of drug supply charges.

They were refused bail and are to appear at Penrith Local Court today.