Are unused sandbox refreshes being carried over to the next contract period?

Unused refreshes are not carried over, we recently renewed and ours did not carry over. We have plenty on our new contract so it wasn't an issue, I'm sure it's something you can negotiate if needed. SuiteAnswers ID: 73853 " How is Sandbox Refreshes Count determined when a license is renewed? When a Sandbox license expires, any unused refreshes are removed. If a Sandbox license is renewed, the Sandbox Refreshes Count is counted based on number of newly purchased refreshes plus the previously used refreshes. "

Thanks!