Long story short. A good friend had a bunch of his vintage, left handed basses stolen from his Long Beach, CA home. He filed a local police report. His favorite was a 60s Vox teardrop shaped bass. Over the next several years, he'd check on eBay for a replacement. About six years later, he found one. Close inspection indicated that it was his. He contacted the police in the US city where the seller had his shop (a musical instrument retailer). The police went to the shop, confiscated the bass and, after my friend agreed to pay the shipping, returned the bass to him.
Same as the above post, the seller was legit and had no idea that the bass was stolen as it passed through a few hands before it ended up with him.
I love happy endings. Best of luck to the OP.