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The firstbits address on the front of the coin (once fully resolved from blockexplorer) is just like any other address right? I can buy a 1 BTC Casascius physical coin, copy the address, bury that coin in my backyard, and use regular transactions to keep increasing its value?
What you see on the front of the coin is not the Firstbits. It's simply a fixed number of first characters of the address. The only robust way to deduce the full address from what you see is Casascius' records, https://www.casascius.com/fulllist.txt. But yes, once you find the address of the coin, it's a normal address you can add more coins to and access them with the private key within.
– Meni Rosenfeld – 2014-09-17T17:22:18.720