Are they loose in the cedar chest? I ask because the bare wood can be bad for them. If they are wrapped inside another piece of fabric or tissue paper, that is good.
You can find a quilt appraiser in your area and get them appraised. The appraiser would also be able to help you with what to do with them. I think it is AQS that has appraisers?
I want to add - what a treasure you have!