You can find a lot of lost and recovered goods for sale at police auctions. This is because when goods are handed in to the police, it is usually possible for the finder to have the goods back if they are not claimed within a certain period of time.
However, if the police find goods, then they can be sold at the discretion of the Chief Constable. Often, the goods end up being auctioned.

A MacBook Air, sold at a police auction for £85, most likely a recovered item of lost or stolen property.
We find that a lot of bikes appear at police auctions especially during the months of fine weather when more people commute to train stations or their place of work.
Other popular items include electronics such as phones, laptops and tablets
Clothing also features highly at one of the key auction houses that we list – this is generally recovered from serial or one-off shoplifters and because of the quantities involved it makes more sense from a monetary point of view to dispose of the items at auction rather than re-unite it with the shops where it came from.
Police and Government Auctions UK contains website links, locations and telephone numbers of a range of auction houses that dispose of items on behalf of the police forces.
Some even specialise in certain types of goods. For example, one of the companies listed holds two auctions per month for well maintained used police and various other emergency services vehicles.

A boxed Dyson DC35 Animal, sold at a liquidation sale for £17, most likely stock from a retailer that has gone bust.
The principal element of the product is an e-book which includes the sources for police, government, car and property auctions.
Our calendar shows key auctions taking place during the current week by auction houses found to deal with items on behalf of the police
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This complementary e-book (PDF download) gives you an insight into how you can bag bargains at abandoned storage unit auctions.