As I mentioned before, there are two types of radio frequency identification tags. The kind of chip in this is what we call a proximity chip, so you have to be within 10 centimetres. The other type is a vicinity chip, which can be read from 30 metres away. That's a very different type of chip. Because those types of chips give off a signal at a greater distance, they are the ones you could put in a sleeve, or you wouldn't have the same type of information on them.
The chips here will have all of the information on page 2. Those chips normally have a number which refers you to a place in a database. Even if somebody skimmed the number on your NEXUS card, for example, all it would give them would be a number that would pinpoint them to a database, which they can't get into anyway.