Saturday's passed, but for others searching the same issue:
If you have coverage through a credit card (Amex, Citi AAdv Plat, etc) you may also request a statement of coverage and a copy of the details of that policy for your trip. In my case Citi Plat was happy to provide these. While I was not asked, it has been noted that some rental agencies in the EU will require a copy at the time of pickup if declining their coverage.