Thanks to everyone for the comments and suggestions. I am going the heat press route and have already had some preliminary discussions with someone in my area who may be able to help in that respect and will be taking one print to him to give this a try. If successful, I will take the others in for the same treatment.
Ernst, prior to deciding to heat press, I tried your decurl method and after a couple of hours, the crease was less noticeable, but still noticeable.
Darlingm, the story is: I have a number of images marketed through a local company, which both markets, prints and supplies to various customers. About a month ago, a rather large and heavy package arrived by courier to my house with, as it turned out, 60 28 X 40 prints (ten each of 6 images) of my work (apparently they send out 10 samples of each image yearly to their "stable" of artists - however, this is the first time for me). All the prints were quite damaged due to a corner of the box being dropped, so I had to send them back. Upon receipt of a new batch, I was moving them around to get a look at them and, due to tight elbowroom in my house, I damaged a stack of ten and put a crease in every one. As they were free and I had already returned the entire flat of 60, I was not prepared to ask for ten more.