What to do if a shelter adoptd out our dog without checking on his microchip?

Question Details: My dog ran away last month and we have been searchiing everywhere for him. He is microchipped. Called police and animal shelter in town,hung up lost dog posters and called the microchip company and reported him missing. I found out yesterday after calling the microchip company again that he was now registered to someone else. A shelter over an hour away found him and never bothered to call then adopted him out. I got a microchip to ensure if he was found he would come home and they never bothered to call when they got him. Was it legal to adopt him out without calling?

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