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Ozzy Osbourne took a shot in the dark, and it's paying off -- some of the music gear looted from a school with ties to his late pal, Randy Rhoads, has been recovered.

Sources connected to the case tell TMZ ... Randy's first electric guitar and the original Peavey amp used for his "Quiet Riot" album were recovered earlier this week after someone turned them in to police. We're told the items have now been handed over to Randy's family.

Our sources say cops are still investigating how the items were stolen in the first place, and at this point, there have been no arrests.

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