It took several months to convince the company that does our determinations that they had made a mistake and the property securing the loan is not in a flood hazard zone. They originally determined that it was.
They have issued us another SFHD form with the current date in the "Date of Determination" box but typed "Originally Completed (date of first determination)" in the Comments section.
My question is - Which date do we rely upon if 6 years from now we rewrite the loan using this property as collateral? Can the determination be relied upon for 7 years from the current date or the original date?

If the first determination was deemed to be incorrect, you should be able to use the date of the correct determination. Put both determinations in the file for a paper trail.

Just order a new determination and don't worry about it. It's only a couple of bucks and would be more effective than pulling the maps to document the fact that the maps have not been updated in order to use the previous determination.