I was sending bubble style large envelopes up to 50 grams for $2-75

Over 50 grams to 125 grams was $7.40

I was told I needed to fill out Customs declaration (green form) as there were objects inside.

If they only contained documents, then on customs form required, and could have posted in postbox.

Maybe CD's and cassettes still come under same category as documents.

I have no idea. I just know I had to fill out the green form.

The new rates only came into force this morning.