I know you likely don't care but one thing idea I liked from the article is to use a QR code engraved/stamped/stickered onto an item so people can contact you without having to put your phone number directly on it.
I'd point them at a static website titled: "I've lost something haven't I? What? Where?" with a basic form put so they can give me details. You could go further and have the QR code put an item ID code into the url.
> But I often I know it's in the house, but can't remember where.
Given the price/importance of a durable umbrella, it would make sense for you to stick a BLE locator tag to it. But for the love of $deity, let it not be built into the product itself, as putting electronics into products is the easiest way to make them fragile and obsolete within few years.
I'd point them at a static website titled: "I've lost something haven't I? What? Where?" with a basic form put so they can give me details. You could go further and have the QR code put an item ID code into the url.
I like the possibilities.