Someone can of course just take the full list provided by Casascius and add whatever satoshi they want. But in showing the coin's address so freely on the web one can expect the original bits to be compromise.
It's like holding a sign with your BTC address on ESPN live. Someone will be tempted to send a satoshi or two just to be funny.
Now to the more deeper issue. In the future, would a collector value a coin with the - original bits, original funded date which matches the stamped date, originally funded by Casascius himself, etc., - ORRRRR
would any of this even matter?
Only time will tell.....
Meanwhile I will try to keep my coin as original as possible