Gill, in the future, if you're concerned about a fragile item getting damaged in the post, you can just ask the seller to use a safer packaging method for the item. I do that sometimes and it works well. I neglected to do it recently though and an item was squished because it wasn't boxed.

$10 is a reasonable refund and you should have probably opened a PayPal dispute. $1.20 for stamps, $1.30 for envelope & other cost.