lost ring 😩😩

On Thursday we went to pick up our daughter, went to walmart, them home. During one of those car rides i put my hair up and forgot my rings in my lap. I know that they are either in walmarts parking lot, or our driveway. I called Walmart, they didnt find it. I searched the car and the driveway, not here. Im so upset. We are struggling with money so that ring was very important. He is so proud of it, but i lost it and of course the warranty doesnt cover loss or theft.  I dont know what to do 😩😩😩

We have the full warranty but i dont think they cover that

For those saying renters insurance, how do you add jewelry? We have allstate renters insurance. Also, if i add the ring now, can i still get it covered?