It turned out to be a package from Rusty:
A box of Rattlesnake eggs.
There was a note:
Tristan. easter greetings and Eggs from lizard Bend. Idaho.
Babs and me were kinda regretting buying the twins pink AK 47's for their third birthday so bought them a box of these to compensate. The boys now spend their time in the trailer eying the eggs, aiming to shoot the rattlers when they hatch before the critters get them. It means that Babs and me can move about a little easier knowing that them AK's ain't aimed at us constant like.
Anyways. Here's a box of eggs for your little one... they make for a mighty interesting egg hunt on a warm spring day.
Rusty.