Okay, at the end of Tremors 4, the townsfolk went out and made sure all the dead Graboids were buried. They didn’t want anyone to know about them, as Hiram mentions.
At the end of Tremors 1, Rhonda LeBeck oversaw removal of the two least-damaged Graboids (the one that hit the flood channel wall and the one in Burt’s basement). They were taken to the college where she was studying, and preserved as well as possible. One ended up in the Smithsonian, believe it or not. The other was sold to a casino in Laughlin, Nevada (similar to the living AB at the end of Tremors 3) and it is not currently known what happened to it.
In Tremors 2, the government of Mexico had no interest in the historical or natural significance of the dead animals, and they were left to the buzzards. Burt, however, carted a number of pieces back to Jodi Chang in Perfection. She sold them off to the highest bidder.
After Tremors 3, a number of scientific institutions collected and studied the remains of Graboids, Shriekers, and ABs.
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