"Federal Law Forbids..." bottles first appear in the mid 1930s as required by a new law which required the embossing.
"This Bottle Not To Be Sold" or "This Bottle Never Sold" refers to the practice of re-use of bottles by a bottler, esp. soda and beer bottles. You will see such embossing on 19th century bottles as well as very early 20th century bottles such as the ones in your photos.
Thanks for posting, add some more pictures of your finds.