So so so so so happy! Praises to the Lord for answered prayers and the hands on earth, who catch, care for and return missing Yorkies! I'm SO relieved and happy for you.
If having a microchip would give you even only a 1% better chance of getting him back should he get out again, and seems like most dogs that go missing do escape more than once, it would be WELL worth it, wouldn't it?
How are the kids?
I'm so happy for your baby's return I'm going to celebrate with a Diet Coke with a teaspoon of real sugar in it!