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How is getting a new bar coded stamp not just compensation?
The problem is not the value of the new stamp. It is the legal and logistical friction required to get it. Under the Fifth Amendment Takings Clause, just compensation usually means full fair market value without placing an undue burden on the individual.
In the UK, the Royal Mail swapped wrongly flagged genuine stamps as fakes. If the USPS forces a swap and a clerk rejects your genuine stamps because they look like high quality fakes, the government has essentially seized your property without compensation. These forever stamps were sold as a non-expiring commodity. Forcing millions of people to prove their property is legitimate, with the risk of erroneous seizure, moves the burden of proof from the government to the citizen.