5500 due 6/30/20

So I have a plan that terminated and their final Form 5500-SF and Form 8955-SSA are due 6/30/20.  We are waiting for them to pay our final bill before filing.  Because of the automatic extension, if I filed it between 7/1 and 7/15/20, do I have to check any box on the form?  Or just send it in like normal?

Thanks for your help!

I would check the special extension box.  Here is a brief thread on how to complete it.