Retired police Detective Terrence Mulligan had given up all hope that he’d ever see his dad’s NYPD gold retirement ring after it was stolen from the family’s Staten Island home over 40 years ago.

But the so-called “shield ring” — engraved with his father’s badge number — shockingly made it back home last week thanks to a detective, a stranger from Boston and some pure luck.

The retirement rings, which are engraved with the word “detective” and “NYPD,” sell for up to $2,000 to $2,500 — but are worth much more to the proud fraternity.

Mulligan, 53, was only 8 when his dad, retired Detective Joe Mulligan, had his ring stolen. He and his seven siblings bought a replacement ring for $1,500 ring for their dad in 2010, seven years before he died — never thinking they’d see the original again.

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