This is what i get when I have the box sizes set.......

USPS Debug Mode Enabled!

weight: 0.0625lb, dimensions: 12x4x1
Setting dimensions: l=12 w=4 h=1 for Weight: 0.0625

USPS Debug Mode Enabled!

weight: 0.0625lb, dimensions: 12x4x1
Setting dimensions: l=12 w=4 h=1 for Weight: 0.0625

United States Postal Service (Priority Mail (2 days))
United States Postal Service (Priority Mail Large Flat Rate Box (2 days))

and this is what I get when it is not set.

weight: +lb, dimensions: regular
Setting dimensions: l=12 w=12 h=12 for Weight: 0.0625
Volume Filtering enabled but volume information not found. Was the database patch applied? Added Insurance, cost:1.80 to Priority Mail
Added Insurance, cost:1.80 to Priority Mail Large Flat Rate Box

USPS Debug Mode Enabled!

weight: +lb, dimensions: regular
Setting dimensions: l=12 w=12 h=12 for Weight: 0.0625
Volume Filtering enabled but volume information not found. Was the database patch applied?Added Insurance, cost:1.80 to Parcel Post

Available Shipping Methods
United States Postal Service (Priority Mail (2 days))
United States Postal Service (Priority Mail Large Flat Rate Box (2 days))

Still no 1st class....

Here is my site link.... starsmagickshop.com