Julio Salazar was found shortly before 5 p.m. on Thursday, the sheriff's office tweeted.
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It was not immediately known where Salazar was found.
Texas EquuSearch said Salazar was last seen on June 19, leaving his home near the 2200 block of Greenhouse.
Officials added that, a few hours later, Salazar might have been spotted near a park entrance in the 19000 block of Saums Road.
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He was reportedly last seen wearing a white shirt with a horizontal blue line across the top of the chest, black jogger pants, black and white high-top tennis/boots, and a baseball cap. He was carrying a black backpack.
The teen was said to have difficulty communicating and only understood Spanish. Officials said he also has a debilitating physical condition and would be unable to ask for help.