Here is a little about the Sample Showcase, as found on the USPS web page:
The “Sample Showcase,” to be distributed nationally on a limited basis as well as in larger quantities to consumers in Charlotte, NC, and Pittsburgh, is a box of assorted beauty, health and snack food items from multiple consumer packaged goods companies. The boxes will be branded with the Postal Service logo and include the tagline, “A selection of free product samples.”
I bolded the part above to point out that this is a national program - I'm in WA and I qualified - Woohoo!
Rumor has it that these could be some of the free samples qualified participants will receive:
Nescafe Taster’s Choice
Aveeno Hair Care
Shower to Shower Body Powder
Dove Silky Smooth Milk Chocolate Bar
Aveeno Skin Care
Reese’s Peanut Butter Cups
McCormick Grill Mates
Bengay Moist Heat Therapy
The free sample kits are limited so hurry up and see if you qualify. Good luck!
*Just as I finished this post, it appears the link to sign up is not working so the offer may be dead. I will update this if it's working again. Sorry!)*