Fedex minimum insurance for special handling

I remember reading the answer to this question before but didn't find it on searching.

What is minimum amount of insurance to purchase for a shipment that makes Fedex take special care of the package? I remember it's some amount $2000 or $5000 something like that. Once someone sent something to me and Fedex called me a couple of times when it was on the way and after it was delivered to make sure it arrived ok. I asked about it and they told me the insurance amount made them take care of it that way.