Please help me find a prayer beads lost in Buenos Aires

I'm Lucía. I lost my late husband's prayer beads last weekend, somewhere between the high street and the bus stop. It's a plain ring worn smooth with age. It isn't valuable to anyone else, but it's one of the last things I've of husband. I've retraced my steps twice and asked at the shops and the bus company. If you've found it, or you have a bin, a bench or a hedge you could check, I'd be grateful. A finder's thank-you is waiting. Please use the offer button here rather than sharing any numbers publicly. Thank you to everyone who has looked.