There are certainly levels of tamper-resistance, and I think these coins appear far more tamper resistant than any other physical bitcoins out there. 
First, if the cases cannot be entered without breaking them, then the crook must somehow manufacture his own identical cases... That is, to say the least, an expensive proposition.
Second, if entering the case destroys the hologram and the signature and the hologram, then two additional barriers are introduced.
Third, the coins themselves are of moderately complex design...and would be far more difficult to counterfeit than most physical bitcoins.
Finally, even if a thief successfully counterfeited a case, Alitin Mint claims to have a proprietary cipher system in place where they can verify if a case is legitimate.

The only other physical bitcoin out there that appears this secure seems to be titan bitcoin.  The only drawback is that [it is my understanding] you have to concede actual ownership of the bitcoins to a third party until they are redeemed.