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I'm assuming that the actual bisection was done by a postal clerk before sale to the public, right?
Done by the post office and distributed to the clerks. This would have to accounted for by any bureaucratic bunch like a post office. Clerks stocks were/are inventoried/counted regularly. Otherwise, "Let's see, we gave you 100 25c stamps, 25fr total. Then you say you cut them in half and sold 100 halves for 2c, 50 halves for 5c, total 4fr50c sold, and have 50 worthless halves left? Good job! You have a future in politics!"
There are (overpaid) philatelic covers around with several stamps each that include a bisect or two, which basically defeat the idea of having provisionals. At least they show the period of use for the bisects.