Answer: Jedediah calls Larry's home phone.
It is a mystery how the little figurine cowboy, Jedediah, dials the phone let alone how he has Larry's home phone number. Nonetheless, Jedediah lets Larry know that the monkey stole the tablet when it was supposed to stay at the Museum of Natural History. We also learn that Akhmenrah's older brother, Kahmunrah, wants the tablet for evil, self-serving purposes.
Teddy Roosevelt, from the Museum of Natural History, tells Larry that the tablet was going to be left behind, while the rest of the unwanted exhibit pieces were going to be shipped, without the life-giving tablet. So of course Larry wants to do something to keep all the figures in the Museum of Natural History.