They used wooden markers apparently that have long since rotted away..............
Yes, but the legislative language and/or Indian treaty line that established the border in the first place would have had a firm definition. The original surveyors would have taken their bearings from that. It’s a bit odd that they used wooden markers rather than stone for the purpose, which is why a new survey is needed. The immediate problem appears to be a matter of simply rounding up the money for the survey, given that there is no current dispute that needs resolution.