One hundred driving licences, 96 mobile phones and 172 bank cards are among items lost by music fans at the 2015 Leeds Festival.
Also being held in lost property after the three-day festival at Bramham Park, Wetherby, are 106 wallets and purses, eight passports and ten sets of car keys.
People wanting to claim back any property they lost at the festival are being asked to email: firstname.lastname@example.org
Items can be claimed up to six weeks after the festival closed.
Around 60,000 people daily visited Bramham Park for the three-day Leeds Festival.
West Yorkshire Police made 56 arrests during the festival, just up on the 51 people arrested last year.
Supt Keith Gilert, said: “Three quarters of those held were questioned in relation to possessing drugs with intent to supply them.
“These arrests were the result of the close working relationships that we have with staff at Leeds Festival and they reflect the continuing efforts being made to keep people safe when they come to Leeds Festival.
“A number of arrests were also made in relation to reported assaults and thefts.
“Although the number of arrests has increased very marginally compared with last year, it remains an extremely small figure for such a major event.
“Protecting people from the dangers of drugs is always a specific priority for the festival’s organisers, who work closely with West Yorkshire Police to target the issue. We also have a roads policing element to the operation that is designed to minimise the disruption that the large volume of traffic in the local area may cause and also respond to any incidents that arise. This operation has gone very well this year, with the force’s protective services operations department contributing officers both in marked vehicles and on motorbikes. We have for the first time used off-road motor bikes to help with deploying officers across what is a large site, and these have undoubtedly helped keep down car crime in the festival’s large car parks.”