All the prints I send out in the various exchanges are temporarily stuck to ratty cardboard using Hama photo corners. I have learned that dry mounted prints are often cracked, while unmounted ones survive intercontinental shipping far better. The cardboard may crack, but the print will only bend. But if the print is mounted, the whole thing may crack...
There are various tapes made among others by Gudy and Hama - both wet and dry, corners by Hama, Lineco, 3L and others.
There is no need to fear wet tape; it is supposed to be so dry when used that fiber prints will not buckle. Even my cyanotypes on thin sketch paper didn't buckle!