U.S. petrochemicals giant Dow Inc and the Singapore government said they were transforming old sneakers into playgrounds and running tracks. Reuters put that promise to the test by planting hidden trackers inside 11 pairs of donated shoes. Most got exported instead.At a rundown market on the Indonesian island of Batam, a small location tracker was beeping from the back of a crumbling second-hand shoe store. A Reuters reporter followed the high-pitched ping to a mound of old sneakers and began digging through the pile.There they were: a pair of blue Nike running shoes with a tracking device hidden in one of the soles.These familiar shoes had traveled by land, then sea and crossed an international border to end up in this heap. They weren’t supposed to be here.