From your comment about Chesapeake sending another check in 2017 at the end of the term of your lease it sounds like your lease may have included an option giving Chesapeake the right to extend your lease beyond the initial five year term by making an additional bonus payment. No additional paperwork would have been required for them to do that.
Check the wording of your lease. Did it include an option, and did the amount Chesapeake paid you equal the bonus required to exercise their option to extend? Based on the operator shown on the permits that have been filed and well that appear to have been drilled involving Sections 11 and 23 it looks like at some point Chesapeake assigned their leases to Anadarko.
Regarding how to pinpoint the location of your acreage, you would need to look at the legal description of your mineral interest in the deed, or other legal document, by which you obtained title to that mineral interest. It should describe which part of those two sections your interest is located in, and you could then compare that to the drilling plats showing the acreage covered by those various wells. If you don’t have a deed or other legal document describing where your interest is located some title research in the Converse County deed records may be required to find those documents.