The standard Casimir pressure between ideal conducting plates, P(a) = −π²ℏc/(240a⁴), is usually derived as the finite remainder of a boundary-conditioned zero-point mode sum. We recover this leading law in a Lean formalization using the Mathlib special value ζ(−3) = 1/120, then identify the boundary-mode deficit as the laboratory-scale instance of the Bosonic Identity Theorem (BIT). BIT states that dark-energy vacuum occupancy, electronic Cooper pairing, protonic Cooper pairing in water, and phantom-ledger occupancy are all instances of bosonic access to the J(1) = 0 identity tick. The Casimir cavity supplies a fifth scale: conducting boundaries remove admissible bosonic identity modes from the gap, and the resulting pressure is the mechanical signature of that identity-tick deficit. The new theorem, formalized in IndisputableMonolith.QFT.CasimirAsBITOccupancy, is that any Casimir correction produced by BIT is bounded by the universal identity-tick cost quantum J(φ) = φ − 3/2 ≈ 0.118. Thus Recognition Science predicts a concrete falsifier: precision Casimir spectroscopy should show no fractional deviation outside the band |δ_φ| ≤ J(φ), with extrema only at φ-ladder cavity scales a_n = λ_rec φⁿ. A deviation outside this band, or a missing bounded resonance under materials designed to couple to the identity-tick channel, falsifies the Casimir-BIT identification.