(a)
General rule
The Secretary shall, upon request, give receipts for all sums collected by him, excepting only when the same are in payment for stamps sold and delivered; but no receipt shall be issued in lieu of a stamp representing a tax.
(b)
Duplicate receipts for payment of estate taxes
The Secretary shall, upon request, give to the person paying the tax under chapter 11 (relating to the estate tax) duplicate receipts, either of which shall be sufficient evidence of such payment, and shall entitle the executor to be credited and allowed the amount thereof by any court having jurisdiction to audit or settle his accounts.