3 ms·They can, but the recipent will see that the package has been opened? It's pretty obvious.by slowmotiony 13y agoThey can, but the recipent will see that the package has been opened? It's pretty obvious.ancarda 13y agoOh that's so obvious I didn't even think of that.hnal943 13y agoDepends on how badly they want to conceal the information. There's a whole discipline around opening documents covertly (flaps and seals).