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Whoever jacked a bunch of jewelry from Kourtney Kardashian’s Calabasas home last weekend knew when, where and what to steal — and all evidence points to it being an inside job.

kasdashian burglary

Sources close to the Kardashians tell us the grandmother of Kourtney’s boyfriend — Scott Disick — died recently and left him a bunch of expensive jewelry. Scott gave the jewels to Kourtney — who already had a bunch of bling lying around, including a $30,000 Cartier watch and vintage jewely left to her by her father, Robert Kardashian.

Kourtney and Scott were only away from the house — which is in a gated community — between 7 PM and 8:30 PM on the night of the buglary. So whoever ransacked their place had to know where all the jewels were stashed in order to pilfer so much stuff from the place in such a small amount of time.

The burglary is currently under investigation.