Whatever we might or might not 'easily believe' - the only data points that we actually have are that the known splinters of the true cross would easily fit into a shoebox
It's going-home time here. Hope you all have a glorious weekend.
You and I are both conjecturing. You found a metric to support identified items with no word on the methodology. Absence of evidence is not evidence of absence. Believing the worst of humanity rarely involves disappointment.