This has been here for a few days so presumably it has not been missed. On a related topic, the upper reaches of the rio Chillar in Nerja have always been a haven for discarded footwear, with shoes to be seen every few metres.
You come across the odd pair, but normally it is a single shoe, generally left foot. They obviously don’t make them like they used to. At the height of the season, seeing 20 or 30 shoes within two or three kilometres is far from unusual.