Buying a replacement for it.
Quite a few years ago, my wife could not find her diamond engagement ring; she remembered taking it off in the bathroom and putting it in a small dish next to the sink on the vanity. We searched all over, even took the trap off the sink, but couldn't find it. It was insured, so we call USAA and file a claim. They sent us a new ring, we were happy. The very next day after getting the new ring, we found the original, on our then 9-year old younger daughter's finger. She had seen the ring and thought it was pretty, no idea of its value, and decided to wear it (she liked to "dress up") She'd even worn it to school a couple of times. We called USAA, they said no problem, we sent the new ring back. It was amazing how close the two rings were, they only way to tell them apart was how clean the new ring was.
Last week, I couldn't find my folding knife, and I'd used it only a couple of hours before missing it. It is a SOG Trident, assisted opening, has a pocket clip and a slot in the grip for cutting paracord. After three days of not having it (I have other knives, but this is my go-to), I order another SOG folding knife on Amazon. It was delivered this morning. Guess what I found last night in my workshop, in a place I'd never thought to look? Now I have two nice folding knives. Original is on top, new one on the bottom: