I'm exactly the same way--I have instructions for everything. I bought this particular one brand new from Sam's Club a few years back and it has served admirably as a cover for my well. I recently had to move it to make way for the new house construction, and that's why I dug up the instructions and had them so handy.
My husband threw the instrutions away because they were so easy to get on the internet. I have been searching for these and I think you could be a lifesaver. Could you please send my the instructions? I cannot believe I have found you.