Shipping snakes

I am going to use UPS to shipp a couple snakes and I need to know----What type of box they should be in? I have a box that has styrofoam inside the cardboard with holes in the sides. Do I have to lable the box as LIZARDS to be able to ship through UPS? Will I need to put styrofoam peanuts in around the snakes? Should I put the snakes in a bag or deli cups. Does UPS check the package before shipping?
JDM

place the snake into a deli cup, tape the top of the cup on at least 3 sides

Prepare a box place strofoam walls onto all sides of the inside of the box ( or obtain a premade shipping box from a site like http://www.reptilepackaging.com/ )

place shredded paper or other filler that is breathable into the box

place deli cup into box

pad all sides and top of deli cup with ample shredded paper or other filler that is breathable

tape box closed

ship it

(ALSO, place in to the box a heat pad or cold pack depending on weather of the route the snake will take in shipment if needed)