Use caretag.it to keep track of your items. Attach pre-printed stickers to items, then use the app to take a photo and record any notes. You can add extra notes and photos at any time to form a permanent record which you can use to store information like certificates and receipts. You can also store notes about each item, about its condition, or who it is on loan to. You can access your records through the app, or via the website.