Pilfer points are the reward currency for Safecracking. They can be earned by fencing a non-empty loot bag with Chief Thief Robin in the Thieves' Guild, or by handing in valuables to Darren Lightfinger for 10 points each. Pilfer points can be used to purchase various permanent upgrades and Thieving-related consumable items at Dodgy Derek's reward shop.
Players who have access to numerous teleport options and paying attention to the blue light on safes are able to obtain over 900 pilfer points per hour using the lowest level route of safecracking, the Misthalin safes one. This is because each safe only has 3 dials each, leading to faster looting.