Acetates are usually records that were manufactured BEFORE the official release i. e. for the artist or the record company. Find out here:
[
www.madonnacatalog.com]
This dates back to the times of vinyl records. I don't think today they burn a few test CDs before the sale.
I don't know if the Stones were in negotiations with Apple Records at that time.
[
www.rollingstonesnet.com]