I canceled the return and looked at the Amazon app again. There is no option resembling "incomplete delivery" in my case. It looks like if you ordered only one

I canceled the return and looked at the Amazon app again. There is no option resembling "incomplete delivery" in my case. It looks like if you ordered only one item they assume you got something and they want it back before issuing a refund or replacement. I may just send back their defective envelope with its missing glue strip and hope for the best. I'll be dropping my Prime subscription at the end of the month.