Don't you have a land title, which of course is more evidence than a survey which anyone can pay for and get?
Surveys, at least here and I assume everywhere, also contain parcel numbers, the neighbor's parcel numbers, and the legal owner of each parcel's name right on the survey. Along with the date of the survey. I live in a pretty rural area where 20 acres is a small lot, so having proof of where the property lines are tends to be just as important as the title.
The title proves ownership (kinda), but does not define the outline of the property itself.
If the you need to know if the fence is on your property or the neighbor’s, a title or deed won’t help you find that line.
So if the official survey is lost and you need to know where the land you own is, you will need a survey.